United abrasives – sait 38134 straight cartridge roll 1″ x 2″ x 1/4 120 grit aluminum oxide premium aluminum oxide grain – full taper. 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.