High carbon steel
The countersink is five-bladed, which can discharge wood chips faster during use and drill smooth and flat countersinks in one go, allowing screw heads to be embedded into the workpiece surface. Suitable for drill presses, electric drills, and other tools.
Natural color
3MM, 4MM, 5MM, 6MM, 7MM, 8MM, 10MM (diameter of triangular woodworking drill), with the countersink diameter uniformly 15.8MM.

