The Blue Groove Power is the worlds first wood drill bit to use IRWINs pioneering bi-metal technology creating a drill bit with unrivalled speed and durability even in nail-embedded wood Designed for high-speed precision drilling it marks an end to the frustration that tradesmen experience when their drill bits strike a nail frequently causing standard flat bits to become locked or break The secret behind Blue Groove Powers extraordinary strength is IRWINs bi-metal technology a composition of two high performance components high speed steel and carbon steel which both have their own attributes and benefits The high-speed steel edge provides durability and allows nail cutting while the carbon steel body gives the bit flexibility Each bit in the Blue Groove Power range has a self-feeding tip which helps to pull it through materials as well as three cutting edges which enhance chip removal for a fast clean hole