Shimano WH-RX010-R Left Hand Lock Nut Unit - 02V 9804

Designed for use with the Shimano WH-RX010 rear wheels.

This is also an "A" match for the Shimano FH-RS505 rear hub. "A" match: indicates that the parts are the same (material, finish, size & appearance).

If this is unavailable, then you can use the "B" match lock nut unit from the Shimano WH-RX05-R rear hub. "B" match: indicates that the parts are usable, but may be different (materials, finish, size & appearance).