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Drills true round holes in stainless steel, mild steel, brass, copper, aluminum, plastic and woods up to 1/8″ thick. Stainless steel and aluminum should be drilled at speeds no faster than 300 rpm. cutting oil must be used to preserve the life of the cutting tool when exceeding diameters of 1/2″ and up. Electrical, automotive, plumbing, sheet metal duct work, heating & cooling, pilot holes for knockout punches.