Professional Bonsai Tool 8" Stainless Steel Knob Cutter/Round Edge Cutter(SQ200) Thesphericalknobcutteraredesignedforremovingtrunkknobsandroots.Theheadsphericallyshapedlikeaball.Thesecuttersproduceahollowcircularcutthathealsquicklywithminimalscarring.Comparedtostandardconcavecuttersthecuttingedgesoftheknobcutterarerounded.Theresultsaresphericalcutswhichareroundandhollowandhealwiththemostaestheticandleastvisiblescarring. 8 X 2 X 1 inches