WATERPROOF RUSTPROOF - The lock is weather-proof, waterproof, rust-proof and cut-proof, its shackle is 3/8 inch. It can be used outdoors and also suitable for trucks, lockers, storage units, fences, etc. EASY TO USE - The combination lock is well-made and can open and close the latch smoothly. The black paint has been scratch-resistant. The number rollers roll easily and are very clear to read. STURDY DURABLE-The lock with stainless steel construction and hardened steel shackle for increased strength and security, and there are several drain holes to prevent the accumulation of moisture, so it can be used outdoors year round. SAFE AND CONVENIENT - Our 4-digit combination lock with 10,000 arrangements, which allows multiple people to share the password for access as needed instead of passing around a key. Password can be changed countless times to avoid password leakage. SATISFACTION SERVICE - We are a long-time American Amazon Seller with a high customer satisfaction rating. If you encounter any issues, please do not hesitate to reach out to us and provide us with your order number