This Jacobs BT 40 Rigid Tap Holder is used for # 2 tap collet system with the collet size range from M8 to M24. It has been prebalanced to 6000 RPM at G 6.3. The Jacobs BT 40 Rigid Tap Holder features a quick change style allowing taps to be changed quickly, The Jacobs BT 40 Tap Holder's rigidity provides reliable and easy use for general tapping applications while the torque structure limits can prevent breakage. The Jacobs BT 40 Rigid Tap Holder is used for drilling, radial drilling, milling and air tapping and is suitable for CNC Turning Centers and machining centers with reversible spindles. Like all of Jacobs Chuck's products the Jacobs BT 40 Rigid Tap Holder includes a one year factory warranty.