spare parts of mining machinerytapered button bits/button bits/ rock drill bit/ ... need taper:6, 7,11,12 degree taper. The diameter for taper: 28, 30, 32, 34, 36, 38, 40, 45 (mm ... , carbide button shape and the face shape. Detailed information of spare parts of mining machinery/Tapered drill bit/rock drilling bits/drill ...