🔥 1,900+ five-star reviews—trusted safety for families and rentals.
Lock-it Block-it
Secure fresh air—no tools, no worries, no ugly hardware.
Lock-it Block-it Adjustable Window Security Bar – 2 Devices Block Burglar Entry
Worried about leaving your windows open, but hate feeling trapped? With Lock-it Block-it, you get fresh air and real security—no tools, no hassle. Just measure, click, and breathe easy.
What Customers Are Saying
“After a break-in down the street, I was scared to crack my windows at night. Lock-it Block-it let me sleep with a breeze again—easy to install, super sturdy, and totally renter-friendly! —Samantha R., Chicago”
Get Window Safety That Actually Works
Fresh air without fear—your windows stay open while Lock It Block keeps bad guys out.
🛡️
Stop Break-Ins Dead in Their Tracks
Sleep tight knowing these window locks security your home 24/7. This high-impact bar extends to block forced entry through sliding window tracks—even when you forget. It’s the security solution that stops burglars from entering through open windows. Join thousands who trust this Home Depot safety bar.
Your family stays safe, windows open or closed.
⚡
Set It Up in 30 Seconds Flat
Stick the adhesive strips, adjust, done. This adjustable window security fits 13 adjustable settings for any window track. Works on single-hung windows, sliding glass doors—vertical or horizontal. The extendable bar extends to fit perfectly. Remove it fast when moving—no damage, no lost deposit.
Easy installation means protection right now, not someday.
❤️
Kids Safe, Windows Open
Our window stoppers let air in but keep kids secure. The double-headed push pin stays way out of reach. Now every floor—even upstairs—can vent safely. These 2 devices protect sliding window openings so children play near open while securely locked windows.
Finally, a way to secure windows without sealing them shut.
⭐
Strong Security, Clean Look
Forget ugly window locks that scream “fear.” Our durable blocker vanishes into your window track. The manufacturer built it tough for outdoors—rain-proof, warp-proof, forever-proof. Lock-it Block-it window security bars give extra resistance without looking like a prison.
Protect your home with a solution that looks as good as it works.
Over 1,900 five-star reviews and counting
Find Your Perfect Lock-it Block-it
Secure your home with our top-rated, tool-free window and door security bars—trusted by parents, renters, and hosts for safe ventilation and peace of mind.
Amazon’s Choice
Lock-it Block-it 2 Pack
Secure Airflow, Zero Worry
- ✓ Block intruders while enjoying fresh air—customize the opening for safe, breezy rooms.
- ✓ Installs in seconds without tools or drilling—ideal for renters and busy families.
- ✓ Double-pin childproof lock helps prevent window falls, keeping kids and pets safe.
⚡ Best Seller—Going Fast!
Customer Favorite
Lock-it Block-it 4-Pack Bundle
Whole-Home Peace of Mind
- ✓ Protect every window or door in your home—bundle saves you more per bar.
- ✓ Effortless setup: stick, click, and secure—no hardware or handyman needed.
- ✓ Trusted by 1,900+ families; rated 4.3★ for reliability and value.
⚡ Limited Stock
Editor’s Choice
Lock-it Block-it Extra-Long Bar
Ultimate Sliding Door Defense
- ✓ Extra reach for wide patio doors or oversized windows—fits up to 46 inches.
- ✓ Stay cool & secure: enjoy ventilation without risking break-ins or child accidents.
- ✓ Quick-release for emergencies; blends discreetly with any décor.
⚡ Only a Few Left!
Every Lock-it Block-it is engineered for peace of mind—no drills, no hassle. Choose the bar that fits your space and join thousands who trust our adjustable design for safety and comfort. Amazon fast shipping and easy returns ensure a risk-free purchase.
Peace of Mind, One Window at a Time
We help you secure your space—no tools, no drilling, just instant safety and fresh air.
Born from Real-Life Worries
Lock-it Block-it started with a simple question: why should feeling safe at home be complicated or expensive? After a close call in our founder’s own apartment, we set out to create a solution anyone could use—renters, parents, homeowners, and hosts alike. Our mission is to keep your loved ones safe while letting in the breeze, not the risk. We design every bar with real people in mind: easy to install, strong against break-ins, and childproof for peace of mind. Because everyone deserves to feel secure—without making sacrifices.
“We make home security simple, affordable, and accessible for every window.”
We know what it feels like to worry about your home and family. That’s why we’re committed to making safety easy for you—no special skills required. Every Lock-it Block-it is tested with real families and renters in mind. If you have questions or need help sizing up, we’re always here. Your peace of mind is our promise.
What We Stand For
🛡️
Safety Without Sacrifice
You shouldn’t choose between fresh air and security. Our bars let you enjoy open windows while staying safe from intruders and accidental falls.
❤️
Hassle-Free for Everyone
No drills, no damage. Lock-it Block-it installs in seconds, so renters, parents, and hosts can protect their spaces—stress-free and on any budget.
⭐
Trust Built Daily
Thousands count on us for peace of mind. We listen, improve, and stand by every product—because your trust is our most valuable asset.
4.3★ average from over 1,900 real customer reviews
Real Results from Real People
Discover why thousands trust Lock-it Block-it for safer, breezier homes—authentic stories from real customers like you.
★★★★★
“As a mom of two toddlers in a ground-floor apartment, I was constantly worried about window falls and break-ins. After three weeks with Lock-it Block-it, I finally sleep easy! It took under a minute to install, no tools or drilling needed, and the adjustable stops let me set a safe gap for fresh air. This is honestly the best $20 I’ve spent on home safety.”
Sarah Johnson
Austin, TX • Verified Purchase
Peace of mind knowing my kids are safe and windows are secure.
★★★★★
“I rent a basement suite and can’t drill anything into the frames, so Lock-it Block-it was perfect. Super easy to adjust for airflow but keeps the windows locked tight. The bar looks way better than those old wood sticks I used before. I even ordered more for my sliding patio door after trying one out for a week.”
Michael Chen
Vancouver, Canada • Verified Purchase
Simple security upgrade with zero damage to my rental.
★★★★☆
“It took me a minute to figure out the right notch for my odd-sized window, but once set up, it’s been awesome. I like that I can still open my window for a breeze without worrying about someone reaching in. Would’ve given 5 stars if the instructions were a bit clearer, but I’d still buy again.”
Jessica Rodriguez
Miami, FL
Ventilation without sacrificing safety or style in my apartment.
★★★★★
“As an Airbnb host, guest safety is crucial. I installed Lock-it Block-it on all windows before peak season. It’s quick to fit, unobtrusive, and guests have commented on feeling secure while enjoying fresh air. My listing even got an extra half-star for safety. No tools or permanent changes—ideal for rental properties.”
David Thompson
London, UK • Verified Purchase
Boosted guest trust and improved ratings with easy child-safe window bars.
★★★★★
“I’ve tried cheaper metal clamps before but they didn’t fit my wide vinyl tracks and looked ugly. Lock-it Block-it fits perfectly, blends in with my window, and feels very sturdy for plastic. I measured my track first as recommended and had zero issues installing. Great value for the quality and peace of mind.”
Maria Santos
São Paulo, Brazil • Verified Purchase
Better fit and stronger security compared to previous products I tried.
★★★★☆
“After using Lock-it Block-it for six months, I’m still satisfied. The Velcro strips held up well except during one humid week when I had to re-stick one bar. Overall, it’s discreet and does the job—I recommend it if you want an easy, non-permanent solution for window safety.”
Robert Kim
Seoul, Korea
Reliable security and flexibility over long-term use, despite minor issues.
By the Numbers
2K+
Happy Customers
Customers worldwide trust our products for quality and reliability
98%
Satisfaction Rate
Of customers would recommend us to friends and family
4.3/5
Average Rating
Based on thousands of verified customer reviews
Everything You Need to Know
Clear, honest answers to your top Lock-it Block-it questions—so you can buy with total confidence.
How do I know this is the right product for me?
Lock-it Block-it is designed for anyone who wants window or sliding door security without tools or drilling—perfect for renters, homeowners, parents, or hosts. It fits most window and patio door tracks at least 1 inch wide, adjusts to 13 custom positions, and keeps kids safe while letting in fresh air. If you want a quick, proven solution that’s easy to install and remove, this is the bar that delivers peace of mind. Check our sizing guide to confirm fit before you buy.
Is this worth the price compared to cheaper alternatives?
Absolutely. Lock-it Block-it is made from industrial-grade ABS/PVC, tested to withstand repeated force—unlike wooden dowels or basic clamp locks that don’t adjust, can damage your window frame, or look unsightly. For under $25, you get adjustable, child-safe security and ventilation in one. Most users report years of use without issue, making it a smart investment that protects your property and loved ones far better than cut-rate options.
How difficult is it to set up or use?
Setup is tool-free and takes less than a minute. Just measure your track, peel the adhesive Velcro strips, place the bar, and click the pin to your preferred opening. No drilling or permanent changes required—perfect for renters or quick moves. The bar pops out easily for emergencies or cleaning. Thousands of reviews praise how simple and intuitive it is, even if you’re not handy.
What if I’m not satisfied with my purchase?
Your satisfaction is our top priority. If Lock-it Block-it doesn’t meet your needs, you can return it within 30 days for a full refund—no hassle, no risk. Our team stands behind every bar and is ready to help with exchanges or troubleshooting. Buy with confidence knowing we’re here to make things right.
How reliable is this product in the long term?
Lock-it Block-it is built from high-impact ABS/PVC—resistant to moisture and cracking—and has been drop-tested against wood dowels for superior durability. Many customers use their bars for years without issues, and we offer responsive support if you ever need a replacement part. Expect sturdy, consistent protection that lasts through daily use and seasonal changes.
Are there any hidden costs or fees?
No surprises here! The price you see covers everything: the adjustable bar, adhesive strips, and all installation instructions. There are no setup fees, subscription charges, or extra hardware needed. Shipping rates are shown at checkout and we never charge ongoing or surprise fees.
What technical support do you provide?
Our expert support team is available 7 days a week by email or chat. We’ll help with sizing questions, installation tips, troubleshooting adhesive issues, or anything else you need—even after purchase. Plus, our website offers video guides and printable sizing tools so you get the perfect fit from day one.
How fast will this ship and how is it packaged?
Orders typically ship within 1-2 business days and arrive securely boxed to prevent damage. Each Lock-it Block-it comes individually wrapped with clear instructions and all necessary parts. You’ll receive tracking info as soon as your order leaves our warehouse so you can follow every step until delivery.