Sutton Tools 4-Flute Auger Bits are designed for machine and hand drilling into hard and soft wood. Their four cutting edges make drilling up to 5 times faster than traditional spade bits. Features Four Cutting Edges - Makes drilling up to 5 times faster than standard spade bits., Coarse Screw Point - Draws the bit into the work piece providing fast drilling in hard and soft woods, Hex Shank - For positive grip, preventing slippage in chuck, Made from alloy steel, Specifications Diameter: 25mm, Total Length: 165mm, Flute Length: 42mm, Shank: 1/4-Hex,