"The stays themselves are great (this model is maybe a little on the short side) but please DO NOT use the screws provided! They are so flimsy that they sheared off in the window frame even though I pre-bored the holes. This left me with having to borrow a tool to cut the remainder of the screws out of a freshly painted frame - very annoying. This product would be much better if it did not include the screws at all, and then I could give a higher rating for performance. I also ordered the locking fixture for safety, the key system works fine and I threw away the screws immediately!"