●Bi-metal hole saw for use in wood, metal, plastic, drywall and insulation panels (e.g. plasterboard and OSB) ●Progressive variable teeth made of high speed steel (HSS), large ejection holes, diameter 9.5 mm hex shaft ●Available in various diameters, 40 mm cutting depth for numerous projects in interior construction and metal construction ●Working diameter: 68 mm; shaft diameter: 9.5 mm