... good durable performancePowder phenolic resin:Good technological efficiency,a smaller forming density,greater abrasives structure..Details Size(mm)Size(inch) ... ,steel sheets,high tensile metal,alloy steel, quench steel, tool steel,mild steels,cast steels and hard iron casting metal2 ... correct diameter.4.Make sure workpiece is stable.Hold the tool so that the wheel is at a perpendicular angle ...