NWT Master Lock Blue Lock Brand new in plastic! BLUE Dial Combination Padlock Anti Shim Lock Indoor padlock is best used as a school locker lock and gym lock, providing protection and security from theft. Preset three-digit combination lock for keyless convenience. Combo lock is constructed with a metal body, anodized aluminum. Cover, hardened steel shackle, and anti-shim locking mechanism for strength and security. 1-7/8 in. (48 mm) wide lock body; 9/32 in. (7 mm) diameter shackle with 3/4 in. (19 mm) length, 13/16 in. (21 mm) width