This structural connection add-in is an API-driven user interface designed to view detailed structural connector geometry and to modify additional parameters in the Revit modeling environment.
See more information about Structural Connections.
Note: To access the Steel Connections Help, hold the cursor over the Connection button, located in the Structure tab 
Connection panel, until the Structural Connection tool tip appears and press the F1 key.
Connection panel, until the Structural Connection tool tip appears and press the F1 key.