top quality and strictly be inspected for blance and runout.ideal for all metal removal and finish mounted stone(abrasive stone,grinding point)1.materialL aluminum oxide and silicon carbide2.bomd:vitrified,resin,rubber3.shank:1/8"(3mm),1/4"(6mm),8mm4.color:brown,black,white,green,pin,red,blue,coffee5.grit: 24#-1200#..........