polishing stone(mounted stone,grinding stone)runout.ideal for all metal removal and finish. polishing stone(mounted stone,grinding stone)materialL aluminum oxide and silicon carbidebomd:vitrified,resin,rubbershank:1/8"(3mm),1/4"(6mm),8mmcolor:brown,black,white,green,pin,red,blue,coffeegrit: 24#-1200#.details and price are available.........