Package Contents: 2 x Window Locks for Windows. Dual switch design, you need to press the priority button to turn on the switch. High Quality Material: The window guard locks are made of high quality environmentally friendly ABS and 304 stainless steel, strong and durable. Adjustable Iron Chain: The window lock chain is adjustable in length and supports up to 20 cm in length. Installation Methods: Adhesive installation. The security lock window restrictor is very easy to install, just keep the surface clean and dry, then peel off the back of the adhesive security locks and stick it on the surface. Multiple Applications: The size of the mini window restrictors is 7.5 x 3.2 cm, which is more suitable for the width of most windows and can be used for wooden, UPVC and aluminum hinged windows, casement windows and sliding windows. Also suitable for doors, refrigerators, washing machines washing, cupboards, closets, bins, etc.