... in Hunan province. A professional Chinese manufacturer of tungsten carbide products such as indexable inserts shims, drilling bits, drawing ... dies, cold forging dies, carbide bars, carbide rods, carbide balls, carbide burrs, etc. Along with our company growth, we ... diameter from 1mm to 30mm, length in 330mm usually, grade in K10 to K40UF tungsten carbide rods with coolant holes