Locking Window Stay Zinc Plated Pack Of 2 Extra Security And Safety For Your Windows Screw On For Use With Casement Window Latch Key & Screws Supplied Length: 46mm Width: 16mm Height: 25mm These window stay locks make it easy to lock your windows and add an extra layer of security to your home or sheds. Simply replace one of your standard stay pins with the locking pin. With the casement stay in the closed position screw the lock section of the pin assembly down with the key and remove the key. The simple and traditional design will fit the majority of casement stays on the UK market and can instantly provide extra security.