The Master Lock Magnum No M40XKAD discus padlock features a 234 in wide stainless steel body for maximum strength, reliability and corrosion resistance The fully shrouded design minimizes shackle exposure and protects against bolt cutter attacks The 38 in Dia octagonal shackle is 58 in long and made of toughcut boroncarbide, 50 harder than hardened steel, offering maximum resistance to cutting and sawing The 4pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering The covered keyway offers maximum weather protection and reinforced body bumper protects against scratches The lifetime assurance provides peace of mind from a brand you can trust