54mm. Laminated steel body, 38 x 9mm hardened steel shackle and 4-pin cylinder. Also includes dual lever locking and ABS bumper to prevent scratching. Shackle length 38mm. Supplied with 2 keys. Specifications: Body W x H x Th: 54 x 38 x 28mm. Max. shackle W x H: 24 x 38mm. Shackle dia: 10mm. Weight: 0.38kg.