Woodworking Reaming Countersink Drill Bit Tool 7PCS Main Features: The chamfer has 5 flutes. It is convenient for the carpenter to use it. In the whole process, the drill can discharge the wood rapidly and sink the hole smoothly immediately. In this way, the screw can perfectly embed in the item. This drill can enlarge and countersink holes. Adjustable counter sleeve depth with the wrench.