Reduced shank, also known as blacksmiths drills, are a general purpose metric HSS drill for drilling steel, cast iron, non-ferrous metals, plastics and wood. With ½” or smaller reduced parallel shank, for drilling larger holes.  For use in bench and power drills equipped with a 13mm chuck, and preferably with variable speed to avoid overheating. Suitable for general purpose drilling in wood metal and plastic. Diameter: 20.0mm Length: 205mm