DURABLE: This keyless combination locking bolt has a zinc alloy body with a durable polyester finish and a weather resistant chrome plated bolt. 4-DIGIT COMBINATION: It features a secure 4-digit combination for added security. EASY TO INSTALL: The lock is easy to install with the anti-tamper screws provided. VERSATILE: It is ideal for both indoor or outdoor applications such as gates, sheds, windows and doors.