This boring type flat bit features patented a micro-groove cutting edge and spurs produce a smoother hole finish. The double spur design scribes the hole before the chips are made, producing a cleaner hole and reducing vibration. The bit has a 0.25in hex shank that fits all drills and 0.25in quick change adapter. Cutting Diameter: 0.5in. Length: 7.75in. Overall Length: 6in. Applicable Material: Wood. Cutting Edge Material: Tool Steel. Height: 0.167in. Length Group: Standard. Point Shape: Brad+Double-Spur+Double-Cutter. Shank Type; Hex. Spiral Angle: CW. Type: Boring Bit. Irwin Speedbor® #99908.