Below are the kind of piston rods we deliver: . Hard chrome plated bar ck45. Quenched and tempered hard chrome plated steel bar ck45Induction hardened chrome plated steel bars ck45. Q+T, induction hardened hard chrome plated steel bars ck45. Q+T, hard chrome plated bar 42CrMo4. Q+T, induction hardened hard chrome plated steel bars 42CrMo4. Hard chrome plated bar 20MnV6. Induction hardened Hard chrome plated bar 20MnV6. Hollow piston rod