1) Grinding wheel of reinforced style 2) Depressed center 3) Coarse surface, used for metal 4) Colors: Black , Brown ,Red 1) Grinding wheel of reinforced style 2) Depressed center 3) Coarse surface, used for metal 4) Colors: Black , Brown ,Red Size(inch)Size(mm)materialRPMmax speedOuter packing(kg/pcs/1ctn)Carton size(LXW/H) mm4x5/32x5/8100x4x16brown alumina 1520080m/s22/300/131x22x324x3/16x5/ ...