These Faithfull Padlocks have a brass body and steel shackle. They have a self-locking action. These Faithfull brass bodied padlocks provide an excellent level of security. Each lock features a high strength, brass cylinder mechanism that is accurately machined, durable and rust resistant. They have stainless shackle springs and a steel shackle. All locks above 30mm in body size have hardened anti-cut and saw resistant shackle with double locking tongues for improved security. Each pack is supplied with 3 keys.The FAIPLB20 Brass Padlock is suitable for use in low security applications such as luggage, lockers and toolboxes. It features a 4-pin tumbler locking mechanism and has the following specifications: Overall Width: 20mm.Internal Shackle (WxH): 10.7 x 11.1mm.Shackle Diameter: 3.3mm.