Stem/steerers started from the late '80s, usually 1" diameter, these particular ones date from about 1994 to 1997 I think. They stopped production in about 1998.
Hose guide/clamp for the Hollowform forks; RC36 Stealth, RC38 Race/LT/ST and RC39. Fit in the canti mount hole in the carbon £12. I have a number of these at the moment.