Cobalt Steel Twist Drills
Perfect for drilling precious and non-ferrous metals. Sold in a package of 10 drills.
Cobalt steel are high-speed steel that contains more cobalt. They hold their hardness at much higher temperatures and can be used to drill stainless steel and other hard materials. Because they are very hard, they can be slightly brittle so it makes sense to offer them in packs of ten.
Cobalt steel twist drill have a maximum operating speed of 20,000rpm