Type C countersink with 82° angle to cut woods and plastics for heads of wood screws. Mounts to taper point drill bit (purchased separately). Can also be mounted on ordinary straight twist drills allowing the screw thread to cut its own hole or by using correct pilot drill size for root diameter of thread allowing shank of screw to force its way into the wood. 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 one length of drill is required for any length of wood.
