Shimano Dura Ace NJS Lockring

Lockring to suit most hubs, produced to a very high quality standard, suitable for use at a pro racing level. These are used by every keirin racer in Japan, and are great for use on the street. They will not fit the thread found on Campagnolo and Phil Wood hubs. They can be used on NJS type Campagnolo hubs, though. Shimano doubled the price of these in July 2009, in Japan.
Note that a lockring is included with Shimano Dura Ace rear hubs, but not with Gran Compe rear hubs. If you buy a Gran Compe rear hub from Track Supermarket, make sure to pick a Shimano lockring up.