? Premium aluminum oxide abrasive for long life ? Heavy, durable X-wt. cotton backing makes these points durable and flexible ? 80-120 grit for deburring, blending, cleaning and applying a light scratch pattern ? 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.