Professional Cobalt Jobber Drill Bit Pre Packed 10.0mm - Faithfull FAIPP420COB, These Faithfull Professional Cobalt Jobber Drill Bits are manufactured from M35 HSSE grade steel with a 5% cobalt content for increased heat resistance and cutting performance. All bits are fully ground and feature a 135° non-slip split point for precise centring and are produced in accordance to DIN 388 for high precision tolerances and geometric accuracy. Cobalt bits cut faster and last longer and are suitable for heavy-duty industrial work in: Alloy steels, carbon steels, cast iron, hardened alloy steels, stainless steels, high temperature alloys, Titanium alloy, high strength steel and carbon fibre composite materials.These Faithfull Professional Cobalt Jobber Drill Bits are supplied pre packed with the following specification: Diameter: 4.2mm.Overall Length:Working Length:Pack Size: 2. Faithfull FAIPP420COB Professional Cobaltl Jobber Drill Bit Pre Packed (2) 4.2mm