5 - Shimano CS 6400 UG cassettes ( UG Specific Fit )..
3 / 7 Sp. 14.15.16.18.20.22.24. & 2 / 6 Sp. 13.14.15.16.17.18
Suitable for use with 1980's 7 Speed Uniglide Freehub ( 1051 / 6400 / Sante / MT 60 . XT 730 - 7 Speed UG Etc )..
Threaded top Sprocket - External thread type UG Series hub...
Top cog - Thread diameter - Approx 34mm...