Outdoor heavy duty bike U-lock is best used as a bicycle lock. U-shaped steel bike lock with key; Includes carrier bracket for easy transportation. Bike lock features a hardened steel body and double locking shackle for superior cutting and prying resistance. Bike lock body is 6-1/8 in. (16 cm) wide, with 8 in. (20 cm) shackle length, 4 in. (10 cm) width and 1/2 in. (13 mm) diameter. Includes one u-lock bike lock, two keys. Vinyl coating for weather and scratch resistance.