The Master Lock Magnum No. M176XDLH solid body padlock features a 2 In. (51 mm) wide zinc die-cast body for strength and reliability. The 3/8 In. (10 mm) diameter octagonal shackle is 2 In. (51 mm) long and made of Tough-Cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. The roller pin cylinder provides maximum pick and pry resistance. The dial cover offers superior weather protection, and reinforced body bumper protects against scratches.