Specifications: 1-9/16 in. wide lock body; 1/4 in. diameter shackle for convenient usage.Outdoor Padlock:All internal pins are brass,All internal springs are stainless-steel & brass,Can be taken as weatherproof padlock,All angles of lock-body are chamfered.Heavy Duty Padlock:Lock-body are solid brass,Each locks weightness is 5.57 OZ,Hardened steel shackles and double-locking bolts for maximum corrosion protection during outdoor or indoor use.Each padlock has 2pcs of brass keys, every keys have numbers. All these keys can unlocking same series locks but cannot do in different series of locks.