Thread extension steel bars for rock drilling: T38 10ft (3050mm) thread size single thread extension rod.
(1) Threaded Connection: R22, R25, R32, R38, T38, T45, T51, and so on.
(2) Diameter: OD32, OD38, HEX32, HEX35, And so on.
(3) Length: 600-6400mm.
(4) Package: Wooden cases or wrapped with plastic knitting and then packed into bundles or as per your requests.