6 Pack Master Lock M1XDLFHC Magnum 1-3/4" Wide Laminated Padlock with Tough-Cut Octagonal Shackle 1-1/2" Height Magnum #1 Choice of Professionals Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel 1-1/2" (38mm) shackle clearance for more uses Dual-Armor protection: 1-3/4" steel core for strength with stainless steel & zinc outer components Dual ball bearing locking for maximum pry resistance