Lock-it Block-it
Lock-it Block-it: Fresh Air Without Fear
The adjustable window security bar that installs in seconds—no tools, no drilling, no landlord permission. Keep your family safe while letting the breeze in. Trusted by parents, renters, and Airbnb hosts.
4.3★ Rating · 1,900+ Families · Amazon's Choice
Why Lock It Block It Beats Other Window Security Bars
Zero Tools Required
Stick, click, and secure in seconds. No drilling, no screws, no handyman. This renter-friendly security bar installs and removes without leaving a mark.
Double-Pin Child Lock
The childproof double-pin lock stops little hands from opening windows too far. Block intruders and prevent falls—one simple bar does both.
Adjustable Fit
Slides to fit windows and sliding doors of different sizes. Customize exactly how much you open up for ventilation while keeping your home locked down.
Secure Any Window in Seconds
No tools, no drilling, no handyman. Lock-it Block-it installs faster than you can open a window.
Measure Your Window
Place the adjustable window security bar in your window or sliding door track. It extends to fit openings of various sizes, so one bar covers most standard windows in your home.
Extend & Position
Pull the bar to your desired length. Want fresh air? Leave a gap for ventilation. Want full lockdown? Extend it completely. You control exactly how far the window opens.
Lock the Double Pins
Press the double-pin childproof lock into place with a click. This two-pin system prevents kids and pets from disabling the bar—only adults can release it.
Enjoy Fresh Air Safely
That's it. Your window is secured against intruders while still letting a breeze through. To remove, simply release the pins and lift out—no marks, no damage, no trace.
Find Your Perfect Security Bar
Block intruders while enjoying fresh air. Lock-it Block-it adjustable window security bars install in seconds—no tools, no drilling, no landlord drama.
Lock-it Block-it
Check PriceLock-it Block-it Official The original adjustable window lock—tool-free security for any window or door.
- Blocks intruders, lets fresh air in
- Installs in seconds, zero tools
- Double-pin childproof safety lock
- Fits most windows and doors
2-Pack Value Bundle
Check PriceLock-it Block-it Official Secure two windows at once—Amazon's Choice for adjustable window security.
- Save more per bar with 2-pack
- Same tool-free quick install
- Child safety double-pin lock
- Great for apartments and rentals
XL 2-Pack Bundle
Check PriceLock-it Block-it Official XL bars for wider windows and patio sliding doors—2-pack saves you more per bar.
- Fits extra-wide windows and doors
- Adjustable sliding door lock bar
- Tool-free setup, renter-friendly
- Double-pin lock for child safety
Lock-it Block-it Specs
Everything you need to know before you buy.
| Installation | Tool-free, no drilling required |
| Lock Type | Double-pin childproof safety lock |
| Material | Heavy-duty steel construction |
| Adjustable Range | Extends to fit standard windows and sliding doors |
| Compatible Surfaces | Windows, sliding glass doors, patio doors |
| Child Safety | Dual-pin lock prevents accidental release by children |
| Renter Friendly | No permanent modifications, removes without damage |
| Ventilation | Customize opening width for airflow while secured |
| Finish | Clean, low-profile design with no visible hardware |
| Available Packs | Single bar, 2-pack bundle, and XL size |
Simple security that installs in seconds, not hours.
Lock-it Block-it was built for one purpose: give every renter, parent, and homeowner real window security without drilling a single hole.
Each adjustable window security bar uses steel-core construction with a double-pin childproof lock—trusted by over 1,900 families nationwide.
Questions? Our support team helps you find the right fit for your windows and doors. Your security is our priority.
Don't Leave Your Windows Unprotected
Lock-it Block-it installs in 30 seconds, requires zero tools, and gives you fresh air without the security risk. Grab the 2-pack and cover more windows for less.
Shop Lock-it Block-it Now →Why 1,900+ Families Trust Lock-it
Here's what makes this adjustable window security bar different from everything else on the market.
Zero Tools, Zero Damage
Most window locks need screws, adhesive, or a drill. Lock-it Block-it needs none of that. You place it, extend it, click the pins, and you're done. Remove it and there's nothing left behind—no holes, no residue, no angry landlord.
Real Childproof Protection
Single-button locks are easy for curious kids to figure out. The double-pin system on Lock-it Block-it requires adult-level dexterity to release. Your children get fresh air in their room. You get peace of mind that they can't open the window further.
Ventilation Without Risk
Traditional security bars seal windows shut. Lock-it Block-it lets you set the exact gap you want—enough for a breeze, too narrow for an intruder. You don't have to choose between fresh air and safety anymore.
Works on Windows and Doors
One product handles horizontal sliding windows, vertical double-hung windows, and sliding glass patio doors. Instead of buying three different security products, you buy one adjustable bar that covers them all.
Renter & Travel Friendly
If you rent your apartment, you can't install permanent hardware. If you're in a hotel, you need something portable. Lock-it Block-it fits both situations—it's light enough to pack in a bag and leaves no trace when removed.
Clean, Low-Profile Look
Old-school burglar bars make your home look like a fortress. Lock-it Block-it sits inside the window track, out of sight from the street. You get steel-grade security without the jailhouse aesthetic.
How to Secure Every Room in Your Home
A simple plan to go from your first Lock-it Block-it bar to whole-home protection—no experience needed.
First Install
- Unbox and extend bar to fit window
- Test the double-pin lock mechanism
- Set your preferred ventilation gap
- Practice quick-release removal
High-Risk Windows
- Secure ground-floor windows first
- Add bars to sliding glass doors
- Lock children's bedroom windows
- Test each bar for snug, rattle-free fit
Full Coverage
- Install on upper-floor windows
- Secure basement and garage entries
- Set ventilation gaps for airflow rooms
- Brief family on how the lock works
Maintain & Travel
- Pack a portable bar for hotel stays
- Check bars monthly for secure fit
- Adjust gap settings by season
- Swap bars between rooms as needed
Key Benefits & Use Cases
Discover all the ways this product can work for you.
Apartment Renters
Install on every window without losing your security deposit. Lock-it Block-it leaves zero marks, holes, or residue when you move out.
Child & Pet Safety
The double-pin childproof lock stops little hands from opening windows too far. Keep fresh air flowing without the risk of falls.
Sliding Door Security
Drop a bar in the track of any sliding glass or patio door. It's the fastest way to block forced entry on your most vulnerable opening.
Airbnb & Vacation Hosts
Offer guests ventilation without compromising property security. Bars install and remove in seconds between guest turnovers.
Travel & Hotel Safety
Toss a portable window lock in your suitcase. Secure unfamiliar hotel or rental windows wherever you sleep.
Ground-Floor Living
First-floor apartments and basement windows are easy targets. Add a steel security bar without the look of ugly burglar bars.
What Our Customers Are Saying
"I rent and can't drill anything. This window lock went in 30 seconds flat. Now I sleep with fresh air and zero worry."
"Got the 2-pack for my toddler's room. The childproof double-pin lock gives me real peace of mind. Kids can't open it."
"I use these in my Airbnb properties. Guests get fresh air, I get ground-floor security. Great burglar bar alternative."
Why Lock-it Block-it Wins
See how we stack up against traditional window security options.
| Feature | Lock-it Block-it Official | Typical Product |
|---|---|---|
| Installation | ✓ Zero tools needed | Drill + hardware |
| Setup Time | ✓ Under 60 seconds | 30-60 minutes |
| Child Safety Lock | ✓ Double-pin lock | None or single pin |
| Renter Friendly | ✓ No holes or damage | Permanent install |
| Adjustable Width | ✓ Fits most windows | Fixed sizes only |
| Fresh Air Access | ✓ Custom opening size | Fully blocks window |
Common Questions
How do I install Lock-it Block-it without tools?
Just place the bar in your window or door track, extend it to fit, and click the lock pins into place. No drilling, no screws, no hardware. The whole process takes under 60 seconds, making it perfect for renters and apartments.
What size windows does the adjustable window security bar fit?
Lock-it Block-it adjusts to fit most standard windows and sliding doors. The telescoping design lets you customize the width to match your exact opening, so one bar works across different window sizes in your home.
Is Lock-it Block-it safe for homes with children and pets?
Yes. The double-pin childproof lock prevents kids from opening or removing the bar on their own. It's specifically designed as a child safety window lock that helps prevent accidental window falls while still allowing controlled ventilation.
Can I use Lock-it Block-it on sliding glass doors?
Absolutely. It works as both a window security bar and a sliding door lock. Place it in the door track, adjust to length, and lock it in position. It's one of the most versatile apartment security solutions available.
How does Lock-it Block-it compare to traditional burglar bars?
Traditional security bars require permanent installation, drilling into frames, and often look industrial. Lock-it Block-it is a burglar bar alternative that installs instantly, leaves no marks, and removes cleanly when you move out or no longer need it.
Can I take Lock-it Block-it when I travel?
Yes. It's lightweight and portable, so you can pack it for hotel rooms, vacation rentals, or Airbnbs. Many users bring it as portable window security for traveling safety, adding an extra layer of protection wherever they stay.
What are Lock-it Block-it reviews saying?
Over 1,900 families trust Lock-it Block-it, with a 4.3-star rating on Amazon. Users consistently praise the tool-free setup, the secure double-pin lock, and how well it works for renters who can't modify their windows or doors.
Will Lock-it Block-it damage my window frame or door track?
No. The renter-friendly design uses no adhesives, screws, or drilling. It sits in the track using tension and locks in place with pins. When you remove it, there's zero damage—your landlord won't even know it was there.