The Master Lock Pro Series Padlocks gives you high security against physical attacks, they are very rugged & will work in extreme weather conditions. The Pro Series offer you a real difference in security, dependability & convenience. 2-5/8" (67mm) wide laminated steel body for superior strength Hardened boron alloy shackle for superior cut resistance 5-spool pin tumbler cylinder for added pick resistance Removable cylinder can be replaced or repined Dual ball bearing locking mechanism resists pulling & prying Body & cylinder covers protect locks from water, dirt & grime Xenoy cover withstands attacks & extreme temperature Supplied with 2 keys Keyed to Differ