Lot of 16 vintage (1960-1970) cast aluminum awning brackets, likely for Flexalum awning brand.  11 have bolts and washers in place (2 per bracket); 2 have just 1 bolt/washer and 3 have no attaching hardware.  'Wave' shaped brackets are 5" long x 2" high x 1" wide.  Have been stored in a workshop since original purchase from manufacturer just waiting for someone creative to figure out how to use them!