Standard aluminum Blind rivets have an aluminum mandrel, available in a standard diameter domed head.
Lightweight Dzus Weldment with S Spring, 1 1/2″ x 1 1/2″
Steel Pop Rivet, Large Flange, 1/8″ (.125″)
Aluminum Rivet Washers
Aluminum Pop Rivet, Large Flange, 3/16″ (.1875″)