... type bits, cross type bits, tapered drill rods and integral drill rods, MF drill pipe.extension drill rod.mainly used for mining, coal cutting ... , tunneling, rock cutting in quarrying.T38 extension drill rod,length from 1220mm,1525mm,1830mm,3660mm to 6095mm.T45 ... to 6095mm.We can manufacture all kinds of bits and drill rod according to customer's special requirement. Any requirement ...