IDEAL 7/16 in. x 18 in. Ship Auger Extension Woodboring Auger Drill BitCompatable with IDEAL Nailbiter and Resi Master auger bits and other 7 16 in hex shank auger bits Adds 18 inches to regular bit length Six flats on shank Heavy duty double set screw type Dual locking hex screws Allen wrench included Quick change shank design Full black oxide coating prevents rust Full body, dual induction heat treatment ensures durability, minimizes warping and delivers long lasting performance Features Series Name N A Sub Brand 7 16