cross drill bit/drill bits/button bit/cross bit/rock drilling bit/sandvik/atlas copco/rock bits Xiamen Betopper Mining Machinery can manufacture the following types caaording to clients need taper:6, 7,11,12 degree taper. The diameter for taper: 28, 30, 32, 34, 36, 38, 40, 45 (mm)We are a professional production Rock Drilling Tools, offering different kinds of Rock Drilling Tools products and ...