What kind of sandpaper is selected to polish the raw edges with the dry mill?

Double-acting 7 mm. Usually, double-acting 7 mm dry grinding should choose to grind burrs, and nothing else will do. Dry grinding is a clean product. After washing, the clothes should be thoroughly cleaned without fading, wrinkling, shrinking and moth-eaten, and the original softness, crispness and bright luster can be maintained.