Diablo DAG2130 1-1/4 in. x 13 in. High Speed Steel Auger Bit 2-step cutting action for precise, clean holes in wood drilling applications Dura-tip for extreme durability in nail-embedded wood Dual cutting edge design for effortless, smooth hole drilling in nail-embedded wood Deep flutes for fast chip removal 7/16 in. hex quick change shank increases stability and durability in cordless and corded impact wrenches and drill drivers