? Latest generation ceramic alumina provides 2X cut rate and 3X life over aluminum oxide ? Heavy, durable X-wt. cotton backing makes these points durable and flexible ? 36-60 grit is recommended for removing heavy burrs, stock removal, removing flash and parting lines and removing rust, scale and pit marks ? 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 ? The tapered roll conforms to smaller areas; fits into irregular concaves, contours, channels ? Next-generation ceramic alumina abrasive grain for significantly faster cut rates, resists wear, resulting in 50-300% longer life, greatest productivity; advanced grinding aid for cooler cutting, longer life ? 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.