Vintage freehub body for first generation 8 speed SIS. This part was originally attached to a Dura Ace rear hub laced to a vintage Mavic rim. on a new wheelset. When the wheelset was purchased, the freehub was replaced with a hyperglide unit (FH-7403) and kept in storage since 1991. Accepts 8 speed uniglide cassette. Smooth and consistent action. Will require special tool for installation (TL-FH10).