Window Locks - 15 Pack for Vertical and Horizontal Sliding Windows, Adjustable Aluminum Stoppers, Security, No-Drill Install, Fits Tracks up to 3/16" Wide

These are fantastic!! I installed two on each window. They are super easy, fast, effective, and affordable!They lay flush against the pane, and the rubber gripper allows for a seal creating a firm secure hold without destroying or marring the integrity of your casing. They fit precisely. They are discreet in size, and will not pop off the casement. They are engineered with that in mind, as they are positioned on the INSIDE of the casement.TIPS:1. Use two locks -- one on each side of the casement. Make sure to position them flush against the pane.2. Remove the rubber lining for ease of initial placement. Slip the lock onto the casement. From the top slide the rubber lining back into place.3. Secure the screws by hand and then tighten using a pair of pliers. You will be amazed at how many more rotations you can achieve, and how tight they become.When used with your casement lock you are afforded an impenetrable window when installed correctly. These will NOT allow your window to open affording optimal security.HIGHLY RECOMMEND!!

These are very good and easy to put on

They fit good on the windows and they are sturdy. Not the most convenient for regular use of the windows because you have to loosen and remove them. They are good for window safety.

High quality product for a great price! They are super easy to install, light weight, and very functional for thief prevention. You cannot open the window AT ALL when this is installed!! Size is ideal and it fits all the windows in my house. Package arrived fully sealed, instructions are on the back, and it has a black piece you insert under the metal part for extra precaution.So happy with my purchase!

After a recent break-in at a neighbor's apartment we decided to invest a little in home security. I looked at many options and decided to purchase this item because it has a rubber lining that protects the window frame (especially important because we rent and don't want to damage the apartment.) We have 11 windows and were able to install one lock on each in about 30 minutes. The installation is straightforward - I would recommend taking the rubber lining out of the lock and place it where you want it on the window and using a hammer guide the aluminum lock in place. Next we tightened the screws with long-nosed pliers (really helps to tighten as much as possible) and tested each lock by trying to open the window. After each test, all the door locks stayed in place, didn't even budge - it would take someone with Herculean strength to move the locks. I would really recommend to tighten the screws with the help of pliers or a wrench - I read a couple of reviews where people just tightened the screws with their hands and were able to make the lock budge but it really helps to use the right equipment.

They looked sturdy. And I was disappointed they didn't fit my windows. Return was easy.

Bought these because my grandson is autistic and he opens windows trying to get outside. My daughter put them up and set them so he can open the window but not wide enough for him to get out. He has no sense of danger so it's a must to keep him safe.

I’m giving this four stars because the package I received was also open but all the parts were in it so it really didn’t bother me at all. And I’m not sure what people are talking about. I put it on my windows and it works just fine. You can’t raise the wind window. There’s a plastic piece inside of it that stops it from doing any damage to the window so I’m not sure what the reviews that are bad or about, but I thought it worked fine and is doing its job.