1, Double discs surface grinding; 2, Vitrified CBN grinding wheels; 3, High ... , ISO 9001:2000 Certified. Vitrified bonded CBN/ Borazon Wheels for Double Disc Surface GrindingDouble Disc Grinding WheelsDouble disc grinding wheel is ... appliations include the grinding of connecting rods,engine valves,valve seats and lifters,brake pads,brake rotors,clutch plates,piston rings ...