Bottom Bracket Retaining Rings - Phil Wood
Stainless steel internally grooved rings that keep the Phil BB from flopping around and allow you to adjust it side-to-side if you want to fine-tune your Q-Factor or chainline. We stock the ones that fit British-threaded frames, which covers 95 percent of the world's frames. We can get Italian or French rings, too.
The Red-marked one goes on the Right (drive) side.
You need at least one Phil tool to install, and two makes life dreamy.