Big Horn 18901 #5 Countersink with Taper Drill from W. L. Fuller # C5M. Universal 1/4-inch quick-change hex shank prevents slipping in standard chucks and is compatible with all 1/4-inch quick-change chucks, including impact drills; Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material. Drilling length can be adjusted for various length screws simply by loosening and Tightening the set screw.
The countersink designed to cut clean and hardened for long wear, is held in place with 2 hex-socket screws that should be set into the flute of the drill. This taper point dill bit is made from high-quality High-Speed Steel and has 1/4” quick-change hex adapter. Combined to make drilling easier and to assure the best possible holding power.