The Glass Door Lock is convenient for glass doors. It is best suited for 11—13 mm (7/16” – 1/2”) thick glass doors and is available for both single and double glass doors. Mul-T-Lock Glass Door Lock is supplied with a four-chamber Mul-T-Lock high security cylinder and 10 mm (3/8”) diameter double locking pin. The cylinder body and plug are made of brass, and the lock body of zinc aluminum. This Glass Door Lock has a drill, pick and collide resistant cylinder.