"MASTERLOCK" MAGNUM RESETTABLE COMBINATION LOCK *2" *2" shackle *Patented 'Boron-Carbide' shackle.  50% harder than hardened steel. *Set your own combination with convenient back up key. *Chrome plated, zinc die cast body for corrosion resistance. *Covered keyway for superior weather protection. Reinforced body bumper to protect against scratching. *Uses M2key blank- Ace no. 50219 *Discovery CON, NBR, SUP