Ammo Can Lock, Ammo Box Lock by AmmoLock Genuine AmmoLock1/2 inch thread, high-quality billet steel, extreme Locking Pin Master brand Padlock with real die-quality steel Keys 1/2 inch steel Fastener, 1/2 inch Nitrile O-Ring Seal 3/16 inch thick Ring Adapter (extreme duty, laser cut, zinc plated) for use on all ammo cans with varied holes in the lid tab such as: 50cal, 40 cal, 7.62 or 30cal, and 20 Cal, mortar boxes, etc. Easy step-by-step Directions with photos