This drill bit is our strongest one! Made with high grade Cobalt High Speed Steel with an HRC 63-66 capable of handling all jobs! The cobalt increases the strength of the steel and makes it more heat resistent. The combination of the 135 degree split tip and parabolic flute allows for very fast and efficient drilling while keeping the bit at a low temperature and debris out of the way. This bit offers a tri cut shank to lower the possibility of the bit slipping in the drill and not turning.