Features: The bike disc brake Rotor is make of Stainless steels, with high strength, not easily to deforms, and excellent rusts prevention and wear resistance. The polygonal airflows designs and large hole spacing provide good heat dissipation performances and reduce brake attenuation and warpage, thus ensuring excellent brake performances. Excellent dry and wet performances, good wear resistance, quickly ventilation and good heat dissipation. Used-as front disc brake bike and rear disc brake bike, easily to install. Mountain bike Rotor is available in two size of 160/180mm. Specifications: Component: Stainless steels Style: G3/HS01/RT56 Diameter Option: 160mm(6.3inch)/180mm(7.09inch) Package Includes: 1pc Bike Disc Brake Rotor 6pcs Screws 1pc 3mm Wrench note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.