Window locks are suitable for sliding windows, sliding doors and vertical windows. Before ordering a window lock, please measure your window track height must be 0.55 inches (1.4 cm) and width must be less than 0.59 inches (1.5 cm). The window lock comes with a vertical key that applies to the center track of the window. Each of our window locks has two mounting holes that allow it to be secured to the window track, greatly enhancing the support of the locking mechanism. The surface is smooth and burr-free and will not hurt your hands. This keyed window lock fits most windows, patio doors, sliding glass doors, casement windows, awning windows, barn doors, garage doors and more, preventing children from opening windows and sliding doors and ensuring personal safety. This window lock is easy to install and requires no tools. Please measure your window frame before purchasing. The two mounting holes on the window lock should be within 1.9-2.3 inches of each other. Material: Metal colour: A-Silver+Yellow Package Contents: 6 x sliding windows 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.