Shimano Cog Spacer (Silver) (2.56mm) (For Dura-Ace CS-7800, Ultegra CS-6600) - Y1Z805000
Shimano Cog Spacer (Silver) (2.56mm) (For Dura-Ace CS-7800, Ultegra CS-6600) - Y1Z805000, Shimano Cassette Spacers Features: 1.0mm spacer goes on freehub body behind 10-Speed cassette (Low) 2.56mm spacer goes between cogs Compatible with Dura-Ace CS-7800 and Ultegra CS-6600 10-speed cassettes