All drills have a 152mm overall length and 86mm flute length. Designed to increase the drilling capacity of drill chucks and for slow speed (350 RPM or less), large scale boring. 118° standard point for general purpose applications. Made from M2 High Speed Steel (HSS) offering the best combination of strength, heat & wear resistance Blue surface finish for ferrous applications. The steam oxide finish prevents chip build-up on the cutting edges and reduces cutting friction, especially in low carbon steels