Internally Geared Hub Small Parts KitsIncludes non-turn washers for vertical dropouts (8R/8L) & horizontal dropouts (6R/6L), cap nuts, cog snap-ring & CJ-8S20 cassette joint. Does not include an Alfine/Nexus cogAlfine hubs are packaged without small parts and require this kit plus a cogNexus hubs are packaged with small parts and cogs and do not require an adtional small parts kitItem SpecificationsFitsSG-8R31/8R36/8C31/S501IncludesNon-turn washers for vertical and horizontal dropouts, axle nuts, snap ring and cassette joint.