The gap regulator pads can be easily adjusted the gap between the brake pad and brake rotor; adjust the position of the brake clamp to prevent scratching of the brake rotor; the wrench has three opening designs (15 mm/18 mm/42 mm), corresponds to most disc brake rotors and serves the purpose of keeping your rotors aligned; simply place the outer sleeve The wrench on the one of the The steering tube, lower the flower nut, align it with the positioning pin of the steering tube and then hit it with a rubber hammer; small size, lightweight, easy to carry and store