The Master Lock No. 187XD Shrouded Padlock features a 2-5/16in (59mm) 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 5/16in (8mm) diameter shackle is 15/16in (24mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking levers provide resistance against prying and hammering. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.