The Master Lock Magnum No M176XDLH Solid Body Padlock features a 2 in 51 mm wide zinc diecast body for strength and reliability The 38 in 10 mm diameter octagonal shackle is 2 in 51 mm long and made of ToughCut boroncarbide, 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 great 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 The Lifetime Guarantee provides peace of mind from a brand you can trust