Diameter:: 13 mm Length:: 190 mm features: BAHCO 13 mm Combination Auger Bit Dual-purpose for use in both electric power drills and hand braces. With a single cutting edge for easy regrinding - though the need for regrinding is reduced as it is made from hardened tool steel for a longer cutting life. Threaded tip for moderate self-feed when using a power drill, but still sufficent self-feed when used in a hand brace. For quick precision cutting with all types of wood.