Padlock Brass 3 keys 4-pin tumbler locking mechanism 6mm thick hardened steel double-locking shackle Size: 40mm Tessi 40Mm Solid Brass Padlock | Te40 The 40mm solid brass body padlock has a 4-pin cylinder and a 6mm hardened steel double-locking shackle making it a great lock for around the house and office. It has a rubber ring around the shackle which helps prevent water ingress when used outdoors. Each lock comes with 3 brass nickel-plated keys as standard.