The Master Lock Excell No. M50EURD discus padlock features a 80 mm 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 12 mm diameter octagonal shackle is 17 mm long and made of Tough-Cut boron-carbide, 50 percent harder than hardened steel, offering maximum resistance to cutting and sawing. The four-pin 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. This padlock is ideal for self storage units, sheds, trailers, moving trucks, vans and more. The limited lifetime warranty provides peace of mind from a brand you can trust.