Description of πͺ Cobalt General Purpose Deg Split Drilling: Cutting-Edge Efficiency for All Drilling Needs
βοΈ COBALT DRILL BIT DIMENSION:1/2"(Diameter) x 4-1/2"( Flute Length) x 6"(Overall Length). βοΈ COBALT MATERIAL: HSS(M35) Cobalt Steel is the premium material with high hardness and red hardness to enable long drilling life and fast drilling performance. βοΈ SURFACE TREATMENT: The Gold Oxide Ember finished surface treatment strongthen the hardness of drill bit body to ensure the long drilling life and better drilling performance. βοΈ SPLIT POINT ANGLE 135 DEG.: No center punch is needed- the aggrevsive 135 deg. Split Point quick-cutting points are self- centering and penetrate quickly with less pressure. will not "walk" or"wander". βοΈ APPLICATION: Best used for drilling into light-gauge metal, high-carbon steel, aluminum and alloy steel, cast iron, stainless steel and titanium.
I am building a metal building and having to drill many holes to attach windows to a metal frame was a challenge for me and the drill. Three drills were enough for the whole day of window installation.
The description states that these drill bits are good for drilling steel, stainless steel and even wear-resistant steel. We drill 304 stainless steel under 5/32" thick and after only 3 holes the tip is fully rounded. I'm sending them back. Please note: We purchased a Dewalt product and drilled over 20 holes with a drill. It looks almost new apart from a slight discoloration from heat.