White: Fully ground high-speed steel drill bits often appear in white. In addition to the material itself, the quality control during the processing of fully ground high-speed steel is strict and the quality is high. Of course, rolling drill bits can also achieve white color by finely grinding the outer circle.
Black: Place the finished product in a mixture of ammonia and water vapor, and the drill bit that has been insulated and nitrided at a certain temperature is black. Of course, black drill bits may also be made of carbon tool steel, as carbon steel is prone to rust, so it usually needs to undergo blackening treatment.
Yellowish brown: Referred to as cobalt containing diamonds in the industry, cobalt containing diamonds are produced by grinding. Originally white, they were later atomized to form a yellowish brown color. Its hardness can reach HRC54.
Gold: Titanium plated diamond, industrial plating hardness can reach HRC78. Of course, there is also decorative plating, as the name suggests, decorative plating is just for the sake of appearance.
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