This door reinforcement lock is made of , which can withstand use. Features the aluminum alloy material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. Features -Color:Silver -Material:Aluminum alloy -Size: 8.50X7.60X2.50cm;/3.34X2.99X0.98in; -How to operate: Put your index finger on the top of the door lock and your thumb on the bottom, slide the lock from the bottom plate along direction of the door, and then pull it out. - This reinforced lock helps prevent the door from being kicked in and increases the security of your home. - It is easy to match with any door that swings inward. - Widely used in hotels, clubs, upscale clubs, wooden doors, counter doors, and etc. - Sturdy grade construction, durability, non-deformation, impact resistance and aging resistance for reliability. - Excellent craft, carefully down to every detail to give it and beautiful look. Package list: 1 lock 4 x large screws 4 x small screws