D102 - Jobber Drills Blue Bullet Sutton Tools Blue Bullet jobber drills are a general purpose drill bit designed for machine and hand held drilling ferrous metals. The blue finish reduces chip build up on the cutting edge and is a better choice when drilling ferrous materials - 118 web thinned point reduces the amount of thrust required - Precision engineered parallel shank for accurate hole size - 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 Diameter 7.94mm / 5/16 Length 114mm Flute Length 81mm