drill bits,button bits-eleven degree,rock drill bit,drill bits,rock bits,sandvik,atlas copco bits,drilling bits Xiamen Betopper Mining Machinery Co., Ltd offer different kinds of taper bits, all taper bits covers taper button bits,taper chisel bits and taper cross bits.1. Bit Type: button bits-eleven degree2. Diameter : 28mm – 45mm3. Taper: 7 degree, 11 degree, 12 degree4. Bottom Hole: 22mm, 25mm ...