The Alpen 10.0mm HSS Dowel Drill with 1/4" Hex is built from cobalt alloyed high-speed steel, offering superior heat resistance for drilling tough steels with tensile strength over 800 N/mm. Ideal for high alloyed steels, bearing steels, and stainless steel. Brand: Alpen Diameter: 10.0mm Shank: 1/4" Hex Material: Cobalt alloyed high-speed steel (HSS) Heat Resistance: High, for drilling steel with tensile strength over 800 N/mm Application: Suitable for high alloyed steels, bearing steels, hot/cold rolled steels, and stainless steel Precision for accurate dowel holes