This 4 digits combination lock is made in fine quality zinc alloy, the design is keyless with 4 number digits which can provide 10,000 combination passcodes, it is very easy to read and set a personal code, the thief will have huge difficulty to crack the code with hopelessness, The material is sturdy, durable and rust-proof, it is widely used for gym, sports, school, and employee locker, cabinets, cases, hasps, and general storage, etc, for indoors and outdoors in all weather, customized logo imprint is available.