... Mining Machinery Co., Ltd offer different kinds of taper bits, all taper bits covers taper ... and taper cross bits.1. Bit Type: spare parts of drilling machine2. Diameter : 28mm – 45mm3. Taper: ... in mining, quarrying etc. According to the total height of bits, they have short skirt button bits ... bits (about 80mm). Model Taper DegreeDiameter Length No. of buttons & Type mmmm D28b5A1-7227°(6° 11° 12 ...