FIROS Bike U Lock with Cable Heavy Duty Bike Lock, 16mm Bicycle Lock with Security Cable and Sturdy Mounting Bracket for Road Bike Mountain Bike Motorcycle and More (Black, Small with 4FT Cable)

Sturdy: FIROS high security anti-theft bike U-lock thick is made of 0.63inch(including 0.1inch PVC cover) carbon structural steel. Our bicycle lock have been handle by heating and hardening, it is anti-cut, anti-lever and anti-smash, which provide more safety.
Lock hole Dust Cover: Equipped with a dust cover for the lock hole, our bike lock is resistant to rust and block. The PVC cover makes u lock can resist corrosion from dust and dirt to prolong the life of your bike lock.
Portable: the U lock measures 9.45*6.69inch (usable space 7.40*4.49inch), you can put the bicycle lock in your bag or attach it to the frame of your bicycle; comes with an easy to install bracket that is suitable for round bicycle tubes with a diameter of 24.89 - 30 mm
3 Keys: 3 keys with ergonomic design to reduce torque and protect it from bending, breaking or rusting. This bicycle U-lock key has a complicated serpentine groove that is difficult to replicate. It is safer for your beloved bikes.
Convenient use: The bike lock comes with a 5feet renforcement steel cable which is coated with PVC covering, and the whole diameter of it is 0.47inch. With the cable, it will provide your bike with greater locking flexibility and better protection.

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