IRWIN® Blue Groove Wood Power Bit 16mm Thermal Protection They have 5% cobalt for

They have 5% cobalt for higher heat and abrasion resistance and a heavy-duty web construction for strength and durability

Adjustable nose bar for improved fit and reduced fogging of glasses

Half-zip design for easy temperature adjustment

elastic side safety boot

IRWIN® Blue Groove Wood Power Bit 16mm Thermal Protection They have 5% cobalt forThe Blue Groove Power is the world's first wood drill bit to use IRWIN's 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 Power's extraordinary