IRWIN Blue Groove 6X Drill Bits are ideal for drilling wood and offer 6x faster drilling penetration than a standard flat bit. Their Tri-Flute design allows for faster chip ejection and their full screw tips ensure ease of use and pull through. The cutting spurs produce clean holes with minimal breakout and the tapered flute reduces binding. The drill bits are also heat treated for extra durability.3 piece set comprising 1 of each: 20, 22 and 25mm. (Length 165mm).Additional Information:• Overall Length (mm): 165• Pack Qty.: 3