PREMIUM ABRASIVE GRAIN - Premium ceramic grain/abrasive grain blend is ideal for rapid stock removal and dramatically superior wheel life on standard and tough-to-grind alloys.EXTREME LIFE WHEEL - Lasts up to eight times longer than conventional wheels while maintaining a higher cut rate.HIGH CUT RATE - Aggressive grain has fast stock removal that greatly outperforms conventional aluminum oxide and zirconia in difficult grinding applications.REDUCED OPERATING COSTS - Because the wheel has such a long service life, fewer wheels are consumed - wheel change out time and worker downtime is decreased.SUPERIOR STOCK REMOVAL - Exceptional stock removal on stainless steel while providing up to four times longer life.COOLER RUNNING - Designed to work with heat-sensitive materials and resists leaving scorch/heat marks on grinding substrates.TYPE 27 DEPRESSED CENTER GRINDING WHEELMADE IN THE U.S.A.