Cobra Carbide BlackMamba 8XD Coolant Fed hi-performance drill bit is manufactured from premium sub micron grain carbide. Cobra High performance high penetration drills provide accurate hole sizing as well as near burnished holes. 140 degrees point angle and high performance geometry allows for high penetration rates. The Cobra drill comes standard with CH coating that provides unparalleled success in difficult to machine applications. Solid carbide tools offer long tool life and faster cutting speeds than other substrates, but are more brittle and must be used with rigid toolholding systems. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Good working on aluminum alloy, nickel/inconel alloy, cast iron and titanium materials and excellent working on carbon steel, alloy steel, hardened steel and stainless steel. Tolerance: H6 - shank diameter; H7 - cut diameter.