... grade material GC,60# 80#120#,etc WA/A/GC ceramic/vitrified grinding wheel1.It is in high ... brittle, it is made of first grade material A/WA/GC2.it s grain edges are sharp and ... and non-ferrous metal and non metal materials,etc4,a serious of sizes,according to your request, and can ... rangesuper soft softmid softmedium medium hard hardsuper hardsmall rangeD, E, Fsoft 1soft 2soft 3mid soft 1mid soft 2mid ...