Standard Steel Blind rivets have a steel rivet and mandrel, available in a standard diameter domed head.
Steel Pop Rivet, Large Flange, 3/16″ (.1875″)
Closed End Blind Rivet, 1/8″ (.125″ OD)
Heavy-Duty Rivet Nut, 1/4”-20
Closed End Blind Rivet, 3/16″ (.1875″ OD)