... 1.28mm-45mm PDC anchor shank bits/drill bit/drilling tools introductionPDC drill bit is super hard material combined with ... , geological exploration, water and hydroelectric, railway and road, tunneling construction and so on. Two-wing PDC anchor bits (semi-round ... .2. 28mm-45mm PDC anchor shank bits/drill bit/drilling tools specification Drilling parameterDia. mmDrilling pressure (Kg)Rotate speed (rpm ...