Cold drawn steel material; consists of one each extension tube 1.500 in. Od by 1.062 in. Id by 32.344 in. Lg one end thd 1.312 in.-16un-3a other end thd 1.438 adapter 2.500 in. Lg one endthd 1.750 in.-12nf-2b; one each ring 2.062 in. Od by 1.500 in. Id by 0.562 in. Width