No-spark cutter pick National invention patent Good heat resistance Good corrosion ... reduced We are a professional productions base of series of shield cutters,TBM cutters,auger bits,mining ... drilling tools ect. Our products include all kinds of round cutter bit,flat cutter bits and holders ... , U85, U92, U94, U95, U118 etc. 2.Replacement of Betek Part No: B47K17H, B47K19H, B47K22H, B43K, B43H, BHR73 ...