Irwin 10506627 Blue Groove Wood Drill Bits x3 Pc Set A wood-boring bit offering 6 x faster penetration than a standard flat bit. Each bit has been fully heat treated for extra durability. The Tri-flute tapered flute design gives faster chip ejection and less binding during use. FEATURES 165mm in length The cutting spurs produce clean holes with minimal break out and the tapered flute reduces binding Heat treated for extra durability Quick-Change Shank Suitable for natural hard and soft wood, chipboard and other man-made materials CONTENTS 1x 20mm Wood Drill Bit 1x 22mm Wood Drill Bit 1x 25mm Wood Drill Bit