4 Digit Combination Lock --- 10,000 combinations and makes it 10 times harder to break compared to 3-digit combination locks, it provides greater security. The case-hardened steel shackle is 0.8 mm thick and fits all standard-sized zippers and keyholes on the market. Sturdy Construction --- The combination lock is made of high-strength zinc alloy and hardened steel shackle, fine craftsmanship. Heavy-duty combination lock is durable, rust-proof, resistant to cutting and sawing. This lock is strong enough and is difficult to be damaged by human force. Easy to Set --- Easy to set and reset your personal password, the four number wheels are very smooth, making it easy to turn even with gloves. It only takes a few seconds to lock and unlock in daily use. You can use them anywhere and without having to carry a key. Wide Application --- This portable size (75*52*24mm) waterproof combination lock is perfect for indoor and outdoor use. Ideal for gym lockers, school and employee lockers,