Master Lock 8170D U-Lock Bike Lock with Key, 1 Pack , 6-1/8 in. Wide , Black Product Description The Master Lock 8170D U-Lock Bike Lock with Key features a 6-1/8 in. (15 cm) wide hardened steel body for maximum strength and reliability. The 1/2 in. (13 mm) diameter double locking shackle is 8 in. (20 cm) long and made of hardened steel, offering extra resistance to prying, cutting, and sawing. The disc key cylinder prevents picking.. From the Manufacturer The object is to get away on your bike. Not for someone to get away with it. Security doesn't get any tougher than this. These locks are built with double locking shackles and high-security disc cylinders. Pliable rubber coated shackles protect your bike. Features 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 Affordable U-Lock Protection Disc key for additional anti-pick protection Includes carrier bracket for storage convenience 6-1/8-inch by 8-inchby 4-inch Vinyl coating for weather and scratch resistance USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.