Master Lock U-Lock Bike Lock With Key, 8170D, Black, U-Lock For Bicycles, Lock 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. Product Features Outdoor heavy duty bike U-lock is best used as a bicycle lock.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit. 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 Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!