matching set of c. 1920's american vintage industrial cast iron valve stem bonnets salvaged from the boylston factory located in chicago, il. the uniquely shaped valve components can be used as table centerpieces, lamp bases, bookends, coin change or business card trays, etc. each bonnet has been thoroughly cleaned and brushed down to bare metal. designed and fabricated by the boylston steam specialties co., chicago, il. measure 9 inches tall and 10 inches in diameter. priced for the pair. display items not included.