... high quality reasonable price, best services stone cutting discFeatures:1) We can supply grinding wheels and cutting wheels for steel or stone2) Size: 4 ... ", 4-1/2", 5", 7", 9", 12", 14" and 16"Material (the reinforced cutting ... 303) R: hardness grade4) 5: structure number5) B: combined material "resin"6) F: fiber glass reinforced7) 80m/s: r.p.m ...