PCB drilling bits are generally used carbide, because epoxy glass cloth complex copper plate tool wear quickly. The so-called carbide is tungsten carbide powder as matrix, cobalt powder as a binder by pressing, sintering. Usually containing 94% tungsten carbide, cobalt 6%. Because of its high hardness, very wearable, there is a certain strength, suitable for high-speed cutting. But toughness is poor, very brittle, hard alloy in order to improve performance, some use in the carbonized substrate by chemical vapor deposition of a 5 to 7 microns super hard titanium carbide (TIC) or titanium nitride (TIN), it having a higher hardness.

Some of ion implantation technology, titanium, nitrogen, and carbon into a certain depth of its base, not only to improve the hardness and strength but also in the drill bit resharpening can move into these injection components.

Still physically at the top of a layer of diamond film drill, greatly improving the drill bit hardness and wear resistance. The hardness and strength of cemented carbide, and tungsten carbide and cobalt only ratio, but also with particles about. Carbide drill ultra-fine particles having an average grain size of the tungsten carbide phase in less than 1 micron. This drill, not only high hardness and compressive and flexural strength are improved.

In order to save costs many drill shank welded structure, originally as a whole are carbide drill, the rear shank with a stainless steel, costs declined significantly due to the use of different materials, but its dynamic concentricity less than solid carbide drills , particularly in terms of small diameter.

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