Big Horn 18925 #10 Complete Countersink with Taper. W. L. Fuller # C10M. 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.

Features:

• Cutting Diameter: 7/16-Inch
• Drill Hole Size: 13/64-Inch
• High Quality
• Manufactured by W. L. Fuller, Inc.
• Made in USA