مثقاب ثقب منشار Drill Hog، عمود منشار ثقب، محول ظرف لمناشير ثقب 9/16~1-1/8 بوصة

Snapped this onto my 3/4" hole saw for cutting door knob holes and the arbor threaded on tight with zero wobble. The 4" length gives enough shank to clear thicker stock. Chewed through six doors without slipping once.

The 1/4" pilot bit actually stays centered instead of wandering, which made drilling through my cabinet doors way less stressful. Arbor threaded on smooth and the set screw holds tight. Used it for four holes and the bit still cuts clean.

The M7 pilot bit actually stays sharp after drilling through a dozen holes in oak, which surprised me. Threads on the arbor screwed right into my old 1-1/8 saw without any wobble. Finally a chuck adapter that doesn't slip mid-cut.