Set of 6 Mini 1in. Radial Bristle Discs - These mini 1in. 3-M Radial Bristle Discs are safer and longer lasting than wire brushes and are impregnated with abrasive; as the wheel wears fresh abrasive is exposed. Operate at 2,000 - 12,000 rpm. This kit includes 6 dk.brn. 36 grit mini radial bristle discs. Perfect for light finishing and detailing.