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Three piece stepped cone drill set manufactured from high speed steel, resulting in long tool life and extra durability. Each step produces specific sized, parallel holes, with the maximum material thickness being determined by the length of step. The drills are capable of producing or enlarging holes in sheet metals without the need for centre punch or pilot holes, and are designed for use with power tools or pedestal drilling machines for an extensive range of industrial applications. Sizes include: 4 - 12mm (9 step, 6mm shank), 4 - 20mm (9 step, 8mm shank) and 4 - 30mm (14 step, 10mm shank). • Number of Pieces 3 • Range 4 to 30mm • Material High Speed Steel