Non-rekeyable cylinder or universal pin, laminated steel body for superior strength Hardened boron alloy shackles for extra cut resistance Proprietary rustproofing for longer life Commercial grade padlock features superior protection from drilling and prying Dual ball bearings locking for maximum pry resistance making it ideal for industrial applications Choose between Keyed Different (KD), Master Keyed (MK), and Master Keyed/Keyed Alike (MKKA).