Master Lock 45mm Padlock Weather Tough® - 4 PackLaminated steel core with Weather Tough thermoplastic casing protects against extreme weather conditions. Tough cut octagonal boron carbide shackle is 50% harder to cut than hardened steel. Patented octagonal shackle is harder to grip by bolt cutters. Professional grade ball bearing locking mechanism provides maximum pull and pry resistance. 4 keys included. Master Lock use the toughest boron alloy material and cutting edge technology, registering