Norton T1 38A AO Dressing Wheels Type 01 straight dressing wheels with the most friable aluminum oxide abrasive for cool and burn-free truing and dressing. The most versatile vitrified bond engineered to maximize the life of aluminum oxide abrasives. Used on brake controlled truing device to dress medium to fine grit resin and vitrified diamond wheels and cBN wheels. Consistent quality for excellent balance and dimensional accuracy time after time. Pack of 1