【Recodeable and Keyless Security】With our 4-wheel recodeable combination lock bolt, you can choose your favorite code from 10,000 different combinations. And the code can be called smoothly. Security comes with the ease of setting and resetting your combination code without any hassle. You don't need to bring many keys and replace locks because it uses a digital password method. 【Waterproof and Durable Zinc Alloy Material】The bolt code lock is made of zinc alloy and it is durable and weatherproof all year round, the body has a rust-resistant coating so it is waterproof and the barrel bolt dials are chrome-plated. The sliding combination lock comes with pick-resistant dials, a 10mm diameter solid steel sliding bolt, and one-way security screws. 【2 Installation Methods】①Lock Sleeve Installation: When the door frame and the door are on the same plane, the metal sleeve + bolt installation method is adopted. Side Door Installation: When the door frame and the door are at a 90° right angle,