Tungsten carbide hole saws, shallow cut The RUKO tungsten-carbide-tipped hole saws can be used in hand and pillar drills. When employing pillar drills, use manual advance only. Suitable for high-alloyed steels such as stainless and acid-resistant steel (up to 2,0 mm), steel and cast steel, non-ferrous and light metals, plastics, reinforced fabrics, plasterboard and light building boards, wood.