Cutter shell for forming holes of improved cylindricality

摘要: A cutter shell for cutting a circular opening in metal object formed of tubular boring portion and head portion. The has sidewall teeth at the forward circumferential end. is thickness not greater than teeth. an outer perimeter secured to rearward end, being attachable bar by which rotated. abrasive band affixed exterior surface engagement with wall hole as cut smooth round out improved cylindricality.