Stainless steel exhaust studs and flange nuts.
To fit all CBR600 Jellymould models  H/J K/L from 1987-1990
These are a direct replacement for the studs that are fitted as standard.
They come with the machined hexagon in one end so fitting and removing if necessary is simple, will not rust and will continue to look great on your engine for years to come.
 
Always apply a smear of copper grease to all mating threaded parts.