Thule Helium Pro features Super lightweight aluminum construction at half the weight of steel hitch bike racks providing easy installation removal and handling.Wide 7" spacing between bikesGreat bike stability and fit with integrated anti-sway that prevent bike to bike contact and 'disappears' when not neededCompact cradle design accommodates wide variety of bike sizes/frame stylesConvenient access to rear of vehicle - HitchSwitch feature allows rack to be easily tilted downTransferable between hitch receivers fits 1.25" and 2" hitches