A vintage heavy duty Commercial Cookware or Calphalon steamer insert. This one was not stamped as to maker - once had a label. Hard anodized aluminum with steel handles... (not a non-stick finish).
Universal size to fit various pots... aprx. 6" 7" and 8" diameter pots.
Good used condition... some storage silver marks/scratch - these are from rubbing against a stainless steel cookware item in the cabinet.. some minor dishwasher ghosting.
