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.