PREMIUM MATERIAL: Passed over 60,000 professional tests, made of premium zinc alloy, even closing mailbox locks provide better antioxidant performance, water resistant and rust proof, stain resistant corrosion and wear. Universal letterbox lock: 20mm cylinder length, 46mm locking plate, fits on material thickness up to 20mm. Opening angle: 90. This is a standard size cam lock with a diameter of 20mm. Easy assembly: the locking lever serves as a lock which is moved by the turning movement of the key | for quick opening and secure closing of various doors. Protection & Private: Furniture locks with keys provide sufficient security and protect not only your important items, but also your children from dangerous items such as sharp tools and non-edible cleaning products. In addition, it provides great privacy for personal items so that they are not visible to others. Versatile use: suitable for mailboxes, desk drawers, cabinets, table display cases , drawers, desks, jewelry boxes. Product details: Thread diameter: 18 mm. Cylinder diameter: 23.5 mm. Length of the cylinder: 20 mm. For door thickness: maximum 20 mm. Opening angle: 90. Box contents: 5 x cabinet locks. 10 x keys."