Carmex SRH Toolholder With Internal Coolant Bore - For Spiral Mill Threading Inserts - SRH63-9Advantages of Spiral Mill Thread Tools: The spiral designed tools enables a smooth cutting operation at a high feed rate and reduced machining time. The tools suit a wide rang of applications, from machining small components in small machining centers to heavy duty applications in high power milling machines. Spiral fluted toolholders hold 1 to 9 inserts in a comparatively small cutting diameter. The unique clamping method enables optimal