HSS Cobalt Ground Twist Drill Set contains a number of high performance twist drills made from cobalt-alloyed heavy-duty steel offers greater resistance to high temperatures and abrasion than conventional high-speed steel (HSS).
The cobalt content increases heat resistance.
Each piece has precise concentricity and is designed work for a variety of steels.
Suitable for unalloyed and alloyed steel (up to a strength of 1100 N/mm2), hot and cold working steel, reinforced and case-hardened steel, and steel that is rust or acid resistant.
* Point angle 130¡ã degree.
* Surface Golden Brown.
* Metric Sizes: 1.omm to 13.0mm diameter in 0.5mm increments.