Jordan Clark Signature Alloy Bars 610W X 680H New hydroformed aluminum technology has given these bars a huge edge over other aluminium bars. The technique ensures the bars have the lightness of aluminium bars (about 30% lighter than normal chromolly or steel bars) but the strength of steel bars. The Grit Battle bars come as standard to fit with SCS compression but can be used for HIC compression with slight modifications. HIGH Outer Diameter 34.9mm / Inner Diameter 28.6mm