Padlocks shrouded - steel 4-pin cylinder vertical shackle clearance=3/4 keying=k/d. Magnum, 3-1/8 inch, 80mm disc lock padlock, features stainless steel construction for extreme weather protection, uses master lock key blank k1box or ilco blank m1 true value #320-952. Toughcut octagonal boroncarbide shackle. Dual ball bearing locking for maximum pry resistance. Stainless steel construction and covered keyway for weather protection. Reinforced body bumper for scratch resistance. 31/8 inch wide case, 14/32 inch shackle diameter, and 17/32 inch horizontal shackle clearance.