Steel padlock with chain. Shank Size: 3/8-inch diameter. Shackle length: 1-1/4-inch. Inside dimension: 1/8-inch. Padlocks are keyed alike. No charge to stamp your name on the padlock (but minimum quantity for stamping is 15 padlocks). For derails, switch stands, and other rail equipment. Product of Aldon ® Company.