These Sutton Jobber Drill Bits are suitable for drilling ferrous and non-ferrous metals, wood and plastic. Made from High Speed Steels, they feature an Extreme Parabolic Flute. The optimised design provides improved chip ejection and faster drilling speeds. The Self-Centring Geometry-Precision split point delivers faster and more accurate hole placement. These bits are Cordless Drill Optimised which requires reduced drilling pressure resulting in improved battery life.