Gibraltar SC-GRSSMC Road Series Super Multi Clamp Go to amazon.com Related posts Thing need consider when find gibraltar clamp? FeatureMulticlampThe SC-GRSSMC Super Multiclamp is perfect for Gibraltar Road Series (1 1/2") tubular racksMade from Super-hard steel DescriptionA larger multi clamping section with more gripping surface than the SCGRSMC. For mounting heavy items.