Rustproof steel padlock with 4-pin tumbler locking mechanism. Includes two brass keys. 31-8864 is 1-9/16 in. inside shackle dimensions are: 9/32 in. diameter, 3/4 in. vertical, and 5/8 in. horizontal clearance. 31-8865 is 1-1/8 in. wide shackle dimensions are: 3/16 in. diameter, 9/16 in. vertical and 1/2 in. horizontal clearance. 1/card.