High precision Milling chuck BT/ER Heat treatment hardness, Wear resistance, Finish good, Can better ensure ... .1. We have series tool holder cnc,such as BT,NT,SK,SLN ,FMB,Taper shank tool holder machine tool accessories ... for mill,Machining center ,engrarving ,milling machine ,and can clamp any straight cutters and tools CNC TOOL HOLDER High precision Milling chuck BT/ER