This tool permit threading and bevelling in one operation.
The countersink for tap is formed from 3 parts: one ring, one spring and one head. The ring is fixed with 2 screws at 90° degree on the shank of the tap in the correct position, so that when the tool work the spring is not all compressed.
When the tap invert the rotation to go out, the countersink work and execute the countersink.
NOT SUITABLE FOR TAPS WITH SPIRAL POINT.