Produce Hexagonal and round cross sections, Hexagon rods are more rigid, heavier andtransfer energy more efficiently, while increasing flushing. Extension rod size: T38(R38)-H32-R32 Extension rod, L3100mm; T38(R38)-H32-R32 Extension rod,L3700mm; T38(R38)-H32-R32 Extension rod,L4915mm.