Features: The ventilated design of the helps to keep the disc clean, dust does not accumulate on the disc, suitable for long-distance long-term use, and stable performance. Utilizing the cross-drilling technology, the lightweight system ensures heat dissipation when used at high strength; it provides the ability to adapt to the humid environment, and the brakes reach a new level smoothly. Easy to Mount on your Disc Brake Ready Frame and Fork Excellent heat dissipation, Ideal for Shimano Alivio/Deore Disc Brake Systems Specification: Material: Stainless steel Size: 140mm,160mm,180mm,203mm Opposite hole distance 44mm Thickness: 1.9mm Color: As picture shows Package included: 1 x Bike Brake Rotor 6 x Bolts Note: Please allow 1-5mm errors due to manual measurement.