RUKO offers High Speed Steel Hole Saw Set The bi-metal hole saws can be used in hand and pillar drills. When employing pillar drills, use manual advance only. On easily cut materials the varied toothing ensures that the cut is more even and requires less effort. The reduction in vibrations and heat development during cutting achieves up to three times the tool life. Suitable for unalloyed steel (up to 700 N/mm² strength), non-ferrous and light metals, plastics, plasterboard and light building boards, fibreboard, plywood and wood. Contains 1 x 22, 29, 35, 44, 51, 68MM + 1 x A2 & A4 Arbors.