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 in wide case, 9/32 in diameter shackle, and 1 in horizontal shackle clearance. 160 has 2-3/8 in wide case, 11/32 in diameter shackle, and 1-1/4 in horizontal shackle clearance.