... quality steel and tungsten carbide tips 4.Can customize for y We can supply all kinds of coal mining bits, sleeves and holders ,and shearer picks ... shearers,continuous mines etc.We choose high quality steel, and high quality tungsten carbide tip via forging, welding, heat treatment. Steel ... ,S120,S135,S150, S160,S170,S200,etc. For more details please contact us Coal Mining Bits/Mining Bit/Mining Tools