1.Wolfram alloy material: Our auto tire polishing discs are made of highhardness tungsten alloy material, which can ensure a good biting effect, improve grinding efficiency, and withstand frequent use in tire repair workshops, etc., and can maintain shape and effectiveness over time. 2.70grit grinding: Our tire repair grinding wheel uses 70grit, which is precise and easy to operate. It can repair tires and polish very finely. The tire grinding effect is good. The coarse sand can quickly cut through the tire surface, thus speeding up the polishing process. 3.Arcshaped hollow design: Our tire repair polishing disc has an arcshaped, hollow design. The arc fits better against the inner wall of the tire, allowing the tire to penetrate better. The hollow groove can release rubber protection in time and improve grinding efficiency. It is a good tool for tire repair and tire grinding. 4.Easy to install and use: 3.8–4 cm grinding head, 0.9 cm threaded connecting rod; can help you achieve a good tire repair grinding effect; you can use these polishing discs with other pneumatic tools without additional adapters.