General description 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 the step. The drills can produce or enlarge holes in sheet metals without the need for a centre punch or pilot holes. Technical specifications Material: High Speed Steel Number of Pieces: 3 Range: 4 - 30mm 4 - 12mm (9 step, 6mm shank) 4 - 20mm (9 step, 8mm shank) 4 - 30mm (14 step, 10mm shank) Compatibility and accessories Designed for use with power tools or pedestal drilling machines Usage Drilling Hole enlargement Other information