For wood screw processing.
Features
The countersunk is a cone that can be used to drill holes such as screws and countersunk processing for embedded applications. The drill (M type) for dishwashing processing and a medium drill (A-type) for drilling the holes, so you can only replace the worn individual.
Size:
M type (outer cone): 0.4 inch (9 mm) A type (inner conical): 0.1 inch (3.1 mm)
Material:
M type: special steel, A type: High speed