Parlec 40 Taper 1/2″ Bore Dia. 1.75″ Gage Line V Flange End Mill Adapter Review June 24, 2018August 29, 2018 - LoudMandarin Parlec C40-50Em1 ,Cnc End Mill Holder , Cat 40 ,Bore Diameter :0.500Hole Dia : 1/2″Shank Taper : 40Nose Dia : 1.75 ”