... , rock cutting in quarrying.T38 extension drill rod,length from 1220mm,1525mm,1830mm,3660mm to 6095mm.T45 extension drill rod,length from ... 1220mm,1525mm,1830mm,3660mm to 6095mm.T51 extension drill rod,length from 1220mm,1525mm,1830mm,3660mm to 6095mm.We ...