1) Adjustable Plane type design.
2) Wide range of uses as hole diameter size can be adjusted.
3) Alloy blades; smooth cutting; the hole wall are smooth and no glitches; good effect of the straight roundness; opening hole depth is 30mm.
4) Heavy-duty woodworking construction with longest tool life.
5) Multi-functions; Very convenient.
6) Having adjustable two sharp blades on both side of the measure-bars.