• New, Near-Mint, Rare, Unused Shimano Dura Ace EX Gold 6-Speed 12T-21T FH-7260  UniGlide cassette cogs (only) and made in Japan quality from 1978-1983. 
• Fits UniGlide cassette hubs. The small threaded cog ONLY fits UG Dura Ace. The rest of the cogs are splined and fit all UG hubs.
• Splined cogs will also fit HG cassette hubs.
• 12-13-14-17-19-21T and reverse the cogs to double your miles.
• Index and friction-shifting ready.
• For your 126/130mm UG cassette hub.
• FW2898.
• FREE shipping in the USA.