The Top Cross Rail Radius Convex Concave is the primary structural element used to create curved ceiling planes, bulkheads, and vaulted transitions in suspended ceiling assemblies. Unlike standard straight rails, the Radius Convex Concave profile is engineered to be manipulated into precise curves. Whether your design requires a sweeping convex arc or a deep concave recessed feature, this rail provides the rigid support necessary to maintain the ceiling’s integrity while following the desired radius.