✅Drill Bits Size: 1/16"-1/2"(Diameter) ✅Quantity/Package: 20Pcs/10Pcs in a Package. ✅Material: HSS Cobalt High Speed Steel is the best material for improving performance and drilling life when drilling and cutting harder matels, such as stainless steel and other metal. ✅Surface Treatment: The Gold Oxide surface treatment strongthen the hardness of surface by oxiding treatment on the cobalt steel, to ensure the long drilling life and better drilling performance. ✅Unique Function: Cobalt drill bits are more expensive than other drill bits, but if you regular drilling through metal, they are a good investment since they tend to last longer. ✅135 Deg. Split Point: No center punch is needed-- the aggrevsive 135 Deg.
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