Celebrate 100 years of security with the Master Lock 1921D Heavy Duty Outdoor Padlock with Key. This limited edition padlock features the original Master Lock logo, limited edition keys, & a special key chain. A 2-1/8in (54mm) wide reinforced laminated steel body for maximum strength and reliability. The 5/16in (8mm) diameter shackle is 1-1/8in (29mm) long and made of hardened boron alloy, offering maximum resistance to cutting and sawing. A weatherproof lock body and keyway cover is designed to add protection against moisture, dirt and grime. The 4-pin cylinder prevents picking and the dual ball bearing locking provide maximum resistance against prying and hammering..