Our folding lock is made of high strength heat treated steel. It is coated with ABS plastic to ensure that it will not scratch the paint on your bike. The lock unfolds to be 86mm and can be attached to a bike parking rack or any other bar or pole. We include 4 laser cut keys and a mounting bracket with hardware and straps to secure the lock to your bike. Features: 3.5mm Thick steel with ABS coating Heat treated HRC 42-45 Extended size: 86mm (34") Includes 4 keys Includes bracket and hardware to attach to bicycle