Our folding combination lock is made of high strength 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 a mounting bracket with hardware and straps to secure the lock to your bike. 3.5mm Thick steel with ABS coating Extended size: 86mm (34") Includes bracket and hardware to attach to bicycle