Lockring for fixed gear hubs. NJS certified. hardened steel for longlife. 1.29" x 24tpi left-handed threads fits all track hubs except Campagnolo, Phil Wood and Mavic.
My go to lockring. For the price in comparison to it's quality, you can't beat it.
It's a lock ring, but a nice improvement over the Origin 8 I had before (stronger material less easy to dent when tightening).