good quality taper cross bits, cross bits,chisel bits,button bits,cross bits,rock drilling bit,sandvik,atlas copco,rock bits Xiamen Betopper Mining Machinery Co., ... Cross Drill Bits , Chisel Drill Bits, Taper Drill Rods, Thread Drill Bits and other Rock Tools.1. Bit Type: good quality taper cross ... the working life of the taper cross bits. All the taper cross bits have to be reground at regular ...