?Sturdy and Durable? Heavy duty bicycle U lock is made of hardened max-performance steel shackle resists cutting and leverage attacks ?High Security? Mountain bike lock features a zinc alloy lock core and a sophisticated serpentine keyway that is very effective against a variety of keyless unlocks ?Increased Protection? Bike U-lock combin with steel loop cable can provide increased protection for securing front wheel or accessories. With 4ft high-quality steel cable allows greater locking flexibility. For bicycle, motocycle, electric bike ?Design & Performance? U lock bike surface is covered with a silicone coating to protect the road bike from scratches. Bicycle u lock has a mounting bracket and no additional packaging is required ?With 3 Keys? Bike lock set has 3 pure copper keys, so you'll always have 2 spare, No trouble losing the key, Enjoy the fun of cycling