This Jacobs DIN 376 Tap Collet with overload clutch has a Tap Size #1 of M6 with a 4.5 mm Tap Shank and 3.4 mm Drive Square. The Jacobs DIN 376 Tap Collet features a quick change style allowing taps to be changed quickly, along with an overload clutch. The Jacobs DIN 376 Tap Collet's rigidity provides reliable and easy use for general tapping applications while the torque structure limits can prevent breakage. The Jacobs DIN 376 Tap Collet 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 DIN 376 includes a one year factory warranty.