... first grade material GC,60# 80#120#,etc WA/A/GC ceramic/vitrified grinding wheel1.It is in high hardness ... and brittle, it is made of first grade material A/WA/GC2.it s grain edges are sharp and it ... , and non-ferrous metal and non metal materials,etc4,a serious of sizes,according to your request, and can ... 1hard 2YcodeGHJKLMNPQRST this hole can be made flat . WA/A/GC ceramic/vitrified grinding wheel