SPYDER Stinger Woodboring Auger Drill Bit, 6-1/2" x 1-1/2". 7/16" impact shank, for wood & nail-embedded wood. Spyder Stinger auger bits feature an innovative non-clogging, automatic-feeding precision tip for optimal speed, accuracy and no thrust drilling. Hardened cutting edges on this two-fluted bit run smoother than single-flute bits providing greater control and less vibration which makes them ideal for deep hole boring in nail embedded wood. Chuck them into your impacting tool for even greater drilling power. (12015).