5/16" x 7/64" Countersink
Fuller #C4 Type "C" four flute countersink. Used to countersink and counterbore for heads of screws in woods, plastics and non-ferrous materials. Heat treated for long tool life.
The countersink is held in place with two hex-socket screws and is easily adjustable up and down the drill so only one countersink and length of drill is required for one screw size.
Cutting diameter 5/16", drill hole size 7/64", overall length 7/8".
Priced and sold individually.