Body made of alloy steel, teeth made of bimetal HSS M3 steel laser welded. Resistant to high temperatures and abrasion. Progressive tooth pitch guarantees fast and precise drilling and very efficient chip removal. Ideal for making through holes for ventilation, sanitary and water pipes, sewage and drain distribution boxes, junction boxes, contact boxes, locks, halogen lighting, etc. Intended for cutting holes in steel (including stainless steel), cast iron, wood and wood-based materials (e.g. chipboard, laminated, fibreboard, plywood), aluminum and metals and plastics, acrylic glass, plasterboard, etc. Requires the use of an adapter and a centering drill. Technical data: Teeth: HSS M3, Cylinder: alloy steel, Number of teeth per 1 inch TPI: 4-6, Diameter: 102mm, Cutting depth: 40mm, Weight: 400g.