... spec of our tapered button bits:Taper Angle : 4.46" / 6 / 7 / 11 / 12 button bitDia(mm)Length(mm)BUTTON NOWeight(kg)285040.229504 ... customers' requirement of the bit diameter, number of air holes, carbide button shape and the face shape.Tapered drill bits, Cross bits ... bit,mining machine part, carbide bits, tapered drill bits, carbide button bits Quarry machinery drilling bits in factory prices