... #,3.Hardness(1):Q4.Bonding agent:resin5.Reinforced net:two fiberglass netsBlack1220080(1)Generally,please chose reasonable hardness cut off wheel ... : Cutting hard metal,like general steels,ferrous metal,aluminium,iron,angle iron,brass,bronze,carbon steel,casting,railway,non-ferrous metal ... the tool so that the wheel is at a perpendicular angle to the workpiece being cut;5.Keep a light touch ...