High quality material: The adjustable door and window lock consists of an aluminum alloy that is , cannot be used rusted and used repeatedly. Interior sixth lock cylinder design: Compared to other window locks, this window lock has a hexagon lock cylinder design that increases the difficulty when unlocking and prevents it from unlocking by children. security: the sliding window lock is equipped with two key hole screws that offer greater safety for doors and and prevent children from accidentally falling and thieves penetrate. Easy installation: Equipped with an hex key in two versions, it can be easily installed in a small room. You only have to attach it with a key without the need for additional tools or drilling. A wide range of application: Suitable for all types of sliding and sliding doors, the simple and stylish style is suitable for most families. Colour:black Material:Metal Package Contents: 4 x Window Locks 1 x wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.