grinding wheel relieved and recessed both sides contain (white,brown,pink)aluminum oxide,silicon carbide,zirconia oxide ... cloth finishing line and technology from Germany to make high quality coated abrasives. Grinding wheel relieved and recessed both sidesdiameterthicknessholeconcave diameterconcave ... ,75305375860063275675075500590063,75,1002 grinding wheel relieved and recessed both sides-HN