Gibraltar SC-GRSAR Road Series Adjust Rt Angle Clamp Adjustable Right-Angle Clamp for Gibraltar Road Series Racks The adjustable SC-GRSAR right-angle clamp allows for multi-angle tube adjustments for Gibraltar Road Series (GRS) racks It allows multiple angle adjustments via a geared drum key rod/bolt assembly The adjustable SC-GRSAR right-angle clamp allows for multi-angle tube adjustments for Gibraltar Road Series (GRS) racks It allows multiple angle adjustments via a geared drum key rod/bolt assembly