Constructed of high quality SUS304 stainless steel ensuring durability and reliability SUS 304 stainless steel does not rust, high hardness, not easy to deform, strong and durable Spring-loaded locking button can improve anti-theft performance and provide reliable protection against intruders Size: 80 x 40 mm or 3.2 x 1.6 inches (L*W), matte black finish , creating an elegant appearance Sturdy design, give you a safer and more private home