Description The window lock is easy to assemble and operate for windows. It offers excellent added security. Simply switch 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 Jammer Arm will lock or release the sash. - There is a slight sound when rotating, so you 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 Jammers 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 x press buttons