Impresa Sliding Door & Window Locks Pack of 10 | Window locks for Sliding Windows & Doors | Easy Installation Window Lock Without Tools | Fits tracks up to 3/8 inch | Aluminium Window Security Locks

i wasnt happy with the product ..as it was too small and doesnt fit the railing... hence i needed to return it..but there is no option for return at all.

These are great in theory, but just so-so to use. I highly suggest soaking the rubber pieces in boiling water for a few minutes before installing. They metal part fits super snugly, so I had to use a mallet for installation. If you install these on windows that you regularly open/close, they’re actually a real pain in the butt. I’m seriously considering returning them for a better, more convenient system.

This is a cheap and effective way to secure sliding windows as it clamps onto the rails and is fixed into place by the 2 screws. No tools required and serves the job well. However, the black rubber is not attached to the aluminium bracket and separates easily so didn't end up getting used at all. If you have tall windows you will need 2 of these (one at the bottom and one at the top) to fully secure the window.

ajustan muy bien a la medida de la ventana, me gustaria que las tuercas fueran un poco mas pequeñas para que no fueran tan llamativas desde el exterior pero se ajustan muy bien

Ok for some windows. Not that strong and can easily be pushed along to open the window.

These aren’t going to keep anyone out. I put them on as tight as I could and they pop right off when I slide the window up. I’ve tried two different types and neither of them fit tight enough. I just want to be able to open my window a couple of inches and put a lock on it so that it cannot be opened any further. I’ve ordered another kind and I’m hoping it does the trick.