M6 X 6.6mm 3 Flute Straight Shank Solid Pilot Counterbore (2007-0060) ~ Made of high speed steel. ~ Cap screw is M6. ~ Cutter diameter is 11.0mm. ~ Shank diameter is 8.0mm. ~ Overall length is 80mm. ~ Pilot diameter is 6.6mm. ~ Continuous pilot counterbores cut rapidly, smoothly and accurately, producing long spiraling chips rather than small metal particles. ~ The pilot extends the full length of the flute portion of the tool. ~ As cutter flutes are ground back due to wear, a new section of pilot becomes exposed. ~ The pilot head may be cut off to any desired length when repeated sharpening makes it too long for practical use. ~ Continuous pilot counterbores have a life many times that of the conventional type counterbore. Made of high speed steel. Cap screw is M6. Cutter diameter is 11.0mm. Shank diameter is 8.0mm. Overall length is 80mm.