spare parts of mining machinerytapered button bits/button bits/ ... taper:6, 7,11,12 degree taper. The diameter for taper: 28, 30, 32, 34, 36, 38, ... Drilling Tools, offering different kinds of Rock Drilling Tools products and monthly output up to millions pieces ... requirement of the bit diameter, number of air holes, carbide button shape and the face shape. Detailed information of spare parts of mining ...