Big Horn 18905 # 6 Complete Countersink With Taper Drill. Replaces W. L. Fuller # C6M. Both the Countersink bits & the collars have hex nuts for easy adjusting tightening & accurate positioning. Four flute countersink bodies leave a clean, sharp hole and the adjustable stop collar allows you to either set the screw head flush with the surface.
High quality - made in U.S.A. by W. L. Fuller. Complete tapered countersink Number 6 screw size. Cutting diameter 3/8-Inch, drill hole size 9/64-Inch