Dual-Armor protection: laminated steel core for strength surrounded by stainless steel & zinc outer components for weather resistance. Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel. Dual ball bearing locking for maximum pry resistance. Reinforced body bumper for scratch resistance. 4-pin cylinder for increased pick resistance. This Magnum Lock comes in a box of 6, the first 6 padlocks are keyed alike, the next set of 6 are keyed with a different set of Keyed Alike.