VIDEO Jobber Length HSS Heavy Duty Special Hi-Molybdenum tool steel, a 135° split point for fast peneration and accurate starting without a center punch.
HSS Taper Shank Type 510 Taper shank Drill are made to fit tapered holders, standard shank with a 118° point, black oxide flute.
High speed steel (HSS) is a form of tool steel; high speed steel bits are hard, and much more resistant to heat than high carbon steel. They can be used to drill metal, hardwood, and most other materials at greater cutting speeds than carbon steel bits, and have largely replaced carbon steels.
A Ultra Bor Super Premium drill with its thin web will penetrate the work hardening stainless fast enough to continually
cut beneath the chip which is hardening from deformation. This means the drill is cutting softer steel. The cobalt drill, with its thick web, cannot be fed at a fast enough rate to
cut beneath the area which is hardening. As a result the cobalt drill is continually drilling into hardened steel.