Zinc Alloy Material: Made of high quality zinc alloy, smooth, rust-proof and durable. For 5-8m glass. Suitable for frameless glass and 5-8mm thick tempered glass. Easy to Use: Lock and key with mounting mat to protect fragile glass, and no need to drill. Two different mounting options for single and double doors. Secure and Anti-Theft: Solid round locking tongue controlled by coupling keys. You can install it on the door to prevent thieves from entering. Wide Applications: Applies to home doors, swing doors, office doors, hotel bathrooms, display cabinets and much more.