Zinc alloy material: Made of high quality zinc alloy, smooth, rust-proof and durable. For 5-8m glass. Suitable for frameless glass and tempered glass with thickness of 5-8mm. Easy to use: Lock and key with mounting mat to protect fragile glass, no drilling required. Two different mounting options for single and double doors. Safe and anti-theft: Solid round locking tab controlled by clutch key. You can install it on the door to prevent thieves from entering. Wide applications: Application for front doors, swing doors, office doors, hotel bathrooms, showcases and more.