It Is Very Safe To Use The Fubozone Heavy Duty Bike Chain Locks, Bicycle Disc MAXIMUM SAFETY: Bicycle chain lock is made of high-strength manganese steel, the lock core is multi-layer DISC lock core, all-round anti-saw and anti-drill, technically up to grade B, with strong resistance to cutting and anti-saw. It is the patron saint of item safety. PERFECT DESIGN: Chain length is 98 cm, diameter 9 mm, optimal length and thickness. The lock cylinder has a waterproof and dustproof cover, the key is also unique, the plum shape and the anti-theft function are stronger. INTIMATE SERVICE: The bike lock is covered with non-toxic nylon belt, will not scratch the bicycle, motorcycle, each chain lock has a sturdy and beautiful carrying case APPLICATION:bicycles, motorcycles ,sports equipment, garage, farm, fence, tool boxes, electric cars, handcart,Shop?Glass door?And various security applications. 100% MONEY BACK GUARANTEE: Please rest assure to purchase this product. If you are not satisfied for any reason, please contact us and we will be happy to assist you. Or simply return the product for a full refund.