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Chicago-Latrobe 550 115-Piece Heavy-Duty Cobalt Steel Jobber Drill Bit Set
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About this item
- Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
- Crafted according to NAS 907 Type J geometry aerospace standards, the self-centering 135-degree split point effectively drills into tough materials without requiring a pilot hole, creating smaller chips that minimize clogging. Additionally, gold oxide offers a lighter oxide surface treatment compared to the more common black oxide, which is often employed to distinguish cobalt steel tools; the performance remains comparable to that of uncoated tools.
- Sizes in Set: 1/16 - 1/2 x 64ths; #1 - #60; A - Z
- Number of Tools: 115
- Heavy duty construction for increased strength and rigidity compared to standard drill bits