Dual purpose for use in both electric power drills & hand braces. With just one cutting edge for easy regrinding, although regrinding will not be necessary so often, as this auger bit is made from hardened tool steel. It has a threaded tip for moderate self feed when using a power drill, but still sufficent self feed when using a hand brace. Use for quick precision cutting with all types of wood. Overall length varies from 160 210mm. Diameter: 13mm. Length. 190mm.