• Premium aluminum oxide abrasive for long life • Heavy, durable X-wt. cotton backing makes these points durable and flexible • 150-320 grit is recommended for fine blending, cleaning, finishing and polishing • For use with M-9 mandrel • Full taper roll is used when the area to finished is hard to reach with a full cartridge roll • The tapered roll conforms to smaller areas • Fits into irregular concaves, contours, channels • Spiral rolls are strips of abrasive cloth rolled and glued to form a solid shape that is designed to break down during use and reveal the next layer of abrasive. There are mounted on a mandrel and used on high speed grinders for grinding, finishing and polishing channels, fillets and radii and deburring small holes.