These are "Kronos 1911" mantle burner parts. Made by Hugo Schneider in Leipzig Germany circa 1911. Made with American standard threads as they were manufactured to be sent to America. Fits various American made P&A metal and glass lamps. Both have original flame spreaders in good condition. Both are missing the "gallery" which is the part that holds the chimney. Sold for parts only. They cannot be used in their present condition but both are straight with no dents or cracks and can be used to complete or repair other burners.