A few companies in China make high quality Tungsten Carbide Bits for tunnel boring machine (TBM) Cutter Companies.
An example is UKO in Zhuzhou City. Export 80+ countries.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.ukocarbide.com/
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www.ukocarbide.comOur Products Are Mainly Used in Metal Working, Woodworking, Wire Industry, Carbide Cutting Tools Etc. Included Carbide Rolls, Carbide Dies, Spiral Cutterhead.