... .5Xiamen Betopper Mining Machinery Co.,Ltd can manufacture the following types caaording to clients need taper:6, 7,11,12 degree ... , 40, 45 (mm)We are a professional production Rock Drilling Tools, offering different kinds of Rock Drilling Tools products and monthly output up to millions pieces ... , carbide bits, tapered drill bits, carbide button bits Quarry machinery drilling bits in factory prices