HIGH SECURITY: The 4-digit combination lock provides 10,000 combinations with all wheels firmly fixed to make decoding impossible. 7mm thick hardened steel shackle and high-strength zinc alloy body are highly resistant to cutting and sawing. 12mm of the shackle is locked inside the lock body during use, much longer and more secure than most combination locks on the market. It is a sturdy and heavy-duty locker padlock. EASY TO SET: The combination lock allows you to set your own combination by simply pressing a \"SET\" button at the bottom and back. The four number wheels are exposed front and back, making it much easier to turn, even with gloves on. Each dial is designed to click into place with precision and appropriate feel for code adjustment. ANTI-MISOPERATION DESIGN: Most combination locks on the market have their setting mechanism exposed externally, where accidental code setting can occur randomly during daily use, when carried in a bag, or someone plays with the locker locks and renders them unusable. Therefore, ZHEGE adopted the anti-misoperation design in 2021 by adding a black protective cover to the reset button. No longer worry about unknown code changes.