Rated 3.5 out of 5 by 4
Rated 5.0 out of 5.0 by lyes The locks secured all my windows fast, easily, and inexpensively
Each of my horizontally sliding windows have cheap plastic latches that are identical to Prime-Line Sliding and Vertically-Hung Window Latches (Model # F 2589). The plastic latches can be easily broken by prying the window open with a knife, flathead screw driver, etc.
Since I'm a renter, I didn't want to remove the cheap plastic latches and upgrade them with the metal ones (Model # F 2589). So I decided to install removable secondary locks at the top track and bottom track of each closed window.
Now my windows are secure as ever. Best of all, I can leave my windows slightly opened and reposition these secondary locks at a venting position. That way, no one can open my window any further than I have repositioned the secondary locks.
Although the screws did leave a slight pointed imprint on my window tracks (from applying torque with pliers), they did not harm my window tracks or penetrate through them.
If you are looking for a non-marring similar lock, you can try U-9820, U-9821, U-10876 and U-10551. Those locks will not put holes in your track, no matter how much you torque the screws. But they may also break if you apply too much torque because they are not heavy duty like these are.
Tips: If you are worried about someone sticking their arm through an opened window and undoing thumb screws manually...ALWAYS tighten screws with pliers. Pliers give you more torque that your hands can't. A burglar would have to be superman to manually undo pliers-applied torque.
If that's not secure enough for you, just remove thumb screws and purchase same size screws with heads that require specific tools to remove (torx, 7 node, spanner drilled, etc.).
If that doesn't thwart a burglar, nothing will.
September 9, 2013
Rated 1.0 out of 5.0 by Mbster Did not work. . .junk for me
Not only did this not work for my windows (apparently there isn't enough space for it to lock on), it actually damaged my window. The screw thing basically put a hole halfway through my frame. You might say, wait, why did you screw it that tightly. I did so because when it wasn't tight, I was able to easily lift and open my window up and past this "lock." Junk.
May 30, 2013
Rated 4.0 out of 5.0 by bigh fine
the only thing is i wish the screw went in straight insted of at a angle..
January 11, 2012
Rated 4.0 out of 5.0 by PJCC EZ to use, lock freak.
Locks, locks on everything so EZ on and off is important.
August 27, 2009