Keyless convenience. Smooth 3-number dialing. Strong double-wall construction. Stainless steel outer case encloses heavy wrought steel inner case. Permanently lubricated rust-resistant inner working parts. Dial cannot be turned when shackle is under tension, safe guarding combination. Self-locking, automatically disarranging tumblers. Case: 1-7/8 In. wide. Nickel-plated steel swivel shackle, diameter 9/32 In. Clearances: 3/4 In. vertical, 13/16 In. horizontal. Combinations different.