Master Lock 175 set your own combination to easy-to-remember birth years, lucky numbers, or any of 10,000 personalized combinations with this padlock for optimal security at school, work, gym, or home. Designed for general security, the lock lets you set your own numbered combination with four smooth-spinning dials for easy operation. A hardened steel, 1-Inch shackle and solid brass case stand up to rain and inclement weather for years of smooth, rust-free performance.