The Master Lock Excell No. M176EURDLH solid body padlock features a 56 mm wide zinc body for strength and reliability. The 9 mm diameter octagonal shackle is 51 mm long and made of Tough-Cut boron-carbide, 50 percent 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. The lock includes set-your-own combination and the added convenience of a back up key. This padlock is ideal for an outdoor use : Self storage units, sheds, trailers, moving trucks, vans and more. The limited lifetime warranty provides peace of mind from a brand you can trust.