Premium aluminum oxide grain.Excellent for sanding and polishing channels, fillets, recesses, side walls, and bottoms of dead-end holes.Great for high speed deburring and flash removal., Multi-layer, self dressing construction - exposes sharp, new cutting abrasive as each layer wears away.Available in straight and full taper designs - long lasting performance.Quick removal and installation - less downtime.See Accessories for Cartridge Roll Mandrels.