Eagle Tool US EA50018 Installer Drill Bit, Auger Style, 1/2-Inch by 18-Inch, Made in The USA: Wood Drill Bits: Amazon.com: Tools & Home Improvement
Extra Long Flexible Shank Wood Installer Drill Bit with Screw Tip for Wire Cable Pulling Through - China Flexible Shank Wood Install Drill Bit, Auger Drill Bit | Made-in-China.com