DURABLE: This 100mm (4") hasp has and integral self-locking mechanism and is made from strong zinc alloy and steel. VERSATILE: With a 40mm (1.6") hasp width, it is supplied with two keys and 6 screws and is ideal for low level, internal security applications such as display cabinets and storage units. INDOOR USE ONLY: This safety hasp is not suitable for outdoor use.