Compatable 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