Hollow Chrome Bar

We are offering hollow chrome bar, hollow piston rod ( inside surface chromed)

material�ck45,4140, stainless steel 304316, etc.
Outside dia�12mm-500mm
technology�polished, chrome plated.
Outside surface roughness: ra �0.2 micron
outside dia tolerance: iso f7
ovality: 12 iso f7
straightness: � 0.2 mmm
packing�anti-rust oil to be spread on rod surface and each rod to be packed in paper roll and then in wooden case.