Master Lock 6121NLJ Master Bump Proof Padlock, Keyed Different, 2-1/8" Wide High Security Pro Series Padlock, 2-1/2" Shackle 2-1/8" Heavy duty steel body withstand physical attacks Exclusive cover protects lock from water, ice, dirt and grime; Ideal for harsh outdoor conditions Bump Proof Padlock 5-spool pin tumbler cylinder for added pick resistance Keyed Different (KD), Random