Pin tumbler locking mechanisms and chrome-hardened steel shackles to resist tampering. Brass bodies and cylinders resist corrosion. For storage cabinets drawers display and file cabinets gun racks luggage and general security. Two brass plated keys included. 150 has 2 wide case 9/32 diameter shackle and 1 horizontal shackle clearance. 160 has 2-3/8 wide case 11/32 diameter shackle and 1-1/4 horizontal shackle clearance. The Master Lock Solid Brass Padlock comes with a 2-inch wide solid brass body with hardened steel shackle and 5-pin tumbler security. This single pack is keyed different. Master Lock offers a full line of padlocks chains cables and specialty locks for all of your needs.