1.DC Grinding Wheel for mild steel 2.durable, flexible,easy, quick,economic 3.used in grinder for polishing metal,marble, ... Fibre Resinbonded Depressed Center Grinding WheelsGrinding ToolUsage: Polishing disc for metal, stone, stainless steel, marble, parcelain and granite ... grinding. It is used in the cleaning weld of each aspect of automobile, boat, machine production and metallurgical, chemical ...