The window lock is easy to assemble and operate for windows. It offers excellent added security. Simply to secure the handle to the frame, solution for those concerned about a common burglary technique called "levering". Features - Color: White. - Material: Zinc alloy. - Size: 6.50X4.00X2.00cm/2.55X1.57X0.79in - These window locks or door locks can add more protection for your family. - They are easy to fit and easy to operate too- just a of the Arm will lock or release the sash. - There is a slight sound when rotating, will know that someone is closing or opening the window / door. - Sash Blockers are designed to provide additional security for your UPVC doors and windows. - The number of Sash to be installed can be determined according to the size and style of the window. Package list: 4 x window locks 8 x screws 12 buttons