Kingsley Combination Padlock &ndash; 1-Inch Hardened Steel Shackle &ndash; Set Your Own Combination Perfect as a Heavy Duty Locker Lock Set any of 10,000 combinations. Inside or outside use - great for gates, utility boxes, tool chests, and lockers. Shackle Diameter 5/16 in, Shackle Clearance 1 in. Durable zinc alloy prevents corrosion. Looks and works great for many years.