1The 120mm 5 hole bolts bike disc brake rotor is made of high quality stainless steel, which is durable to use. 2After high temperature, quenching, passivation, rust prevention and other processes, it is not easy to deform, rust, and is not afraid of humid, muddy or dusty environments. 3It can protect your electric scooter, reduce the accumulation of brake dust on the wheels, and the air circulates around the brakes to help to dissipate heat. 4With 5 bolts, it is very easy to install and disassemble, and can effectively protect the wheels and prolong the service life. 5Excellent electric bicycle DIY modification accessories, it is suitable for Xiaomi M365, M365 PRO, M365 PRO2 electric scooter and other electric scooters with 5 hole bolt and 2540mm / 06in screw hole spacing.