Irwin 4935570 7/16", 3/8" Diam Hex Shank, 17" Overall Length with 15" Twist, Ship Auger Bit
7/16", 3/8" Diam Hex Shank, 17" Overall Length with 15" Twist, Ship Auger Bit Screw Point, High Speed Steel, Bright Finish, Extendable
$35.40