... productions base of series of shield cutters,TBM cutters,auger bits,mining picks,anflats picks,holder and rock ... drawings.Our products include all kinds of round cutter bit and flat cutter bits for excavate coal machine ... , B47K22H, B43K, B43H, BHR73 etc and coal bolting bit and coal bolting rod.We have exported our products to ... Canada, Korea, Japan, HongKong, Singapore, etc cross rock drill bit-2