Prime-Line U 9809 Sliding Window Lock for Vinyl Windows, White, 2 Pack

These window locks have definitely earned my anxiety’s seal of approval! They work incredibly well and bring me that extra bit of security I was looking for. Ignore the scratches in my pictures—one of them fell off, and my dog (she decided it was her new chew toy) went to town on it. Thankfully, they’ve held up great despite the “extra testing.” They’re super easy to twist on and off, making it simple to open and close the windows. The only slight annoyance? You do have to twist them all the way to adjust the window, which makes sense for security, but can be a bit of a pain when you just want a quick crack of fresh air after overcooking something! One bonus I appreciate is that they’re just tricky enough to keep my child puzzled, which adds that extra layer of peace of mind. I’ve got these on all our windows, and I’d highly recommend them to anyone needing a little extra home security (or pet durability)!

Easy to use and worked perfectly on my new vinyl windows. Windows are secure and don’t move. Would purchase these again.

You'd hear someone trying to get in with these installed. The latch allows for quick removal in an emergency unlike some of the others that require a hex tool.

Wanted lower profile locks for windows so windows could be open through the night, or when nobody is home so air gets in for the pup. These work great.

Better than putting bars on windows since bars cannot be removed in case of emergency/fire. I feel so much safer going to sleep and knowing my kids will be there in the morning and no one can get in. I have purchased several more at this point. Here is some helpful info: I use them on double-hung windows myself. So, if you look at the picture of the little lock, you can see a square on top, a turning knob up front, and tucked behind is a piece that moves forward and backward. You take the lock and open that sliding portion by turning the knob. You open it up big enough to slide the "teeth" of the lock onto the window frame. (See pics) This can attach to any frame as long as the frame is thin enough to fit in the teeth. The teeth open about 1/2", so if the frame you want to attach to is 1/2" thick or thinner/smaller, then you are good to go. Slide it onto the frame (see pic) and turn knob to tighten. Once you have it good and tight, you push the knob flat and that will secure it even more. Note - make sure to use BOTH locks on a single window. In testing, I placed one lock in a way that it would allow the window to open 3-5 inches. I then "pretended" I was trying to get in and took the window from the bottom and shoved it up pretty hard. I did this a few times, and there is enough wiggle by going up and down with the window that I can slowly, but loudly, get the lock to inch up until there is enough room for me to climb into the window. However, it is really hard to do that when BOTH locks are used on either side of the window. Having two in place is a pretty secure situation. I also like that I don't have to screw these into anything, which not only damages the window frame but also allows for only one position. These allow you to move them up and down at anytime, or just remove them. Meaning, you can place them in a way to allow the window to open 3" or 4" or almost all the way open, or almost all the way closed, wherever you want, and you can change it from day to day if you like. Nothing permanent. I love these!

Looks like they are made well, not plastic. 5 stars for quality, minus 2 stars because they don't fit my vinyl sliding windows, because there is a thin lip that would crushed if this lock is used and tightened.

Perfect for my vinyl windows. They screw down tight. Not sure what happened with the reviews that said a child could open the windows with these on. Not the ones I got. These are not budging with me putting adult weight on to them.

Trash product. Does not hold onto the window track strongly enough to provide security. They also scratch the vinyl window. Do not buy.

Terrible, didn’t work to secure the sliding windows, then straight into bin unfortunately. Don’t recommend

Great for stopping lower sash from being raised but obviously doesn't stop upper ( rear) sash being lowered! Still looking for a solution to this which doesn't involve drilling into the frame.

Funciona muy bien para asegurarlas ventanas y el material se siente resistente. Lo volveré a pedir para otras

Perfect for controlling and securing the windows. They came assembled and ready to use. The cam-lock was especially intuitive for a cyclist as they are much like my front and rear axles. I know how I trust my wheels to stay put so do I trust these quality cam-locks to perform. Great product and will recommend to family and friends. Thank you Prime Line Products!

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