... ,cross bits,rock drilling bit,sandvik,high quality blade bit,cross bit Xiamen Betopper Mining Machinery Co., ... Water Hole: 3The taper cross bits can be used under any rock drilling condition because of it' ... s comprehensive adaptability.Taper chisel bit is mainly used for hard rock, tapered cross bits and tapered ... button bit are mainly used for fissural rock.The tapered cross bit is ...