The G & J Hall CONECUT® is a versatile hole-cutting tool for rapid drilling and enlarging holes in thin materials up to 2mm thick. Designed for industrial applications, the diameter of the hole increases as the CONECUT® is advanced into the material, providing infinitely variable sizes For use in sheet steel, non-ferrous metals, plastics, Formica and plywood The conical shape of the tool enables any size of hole to be drilled between the bottom and the top of the taper. When drilling metals always use a coolant. Conecut® applications: Electrical Heating Ventilation Plumbing Shop fitting installations etc. Auto body repair Control panels Sheet metalwork etc. Maintenance The Halls CC O CONECUT® High Speed Steel Sheet & Tube Drill Bit has the following specification: Size Range: 6 - 20mm. Chuck: 3/8in/10mm. HLL1