Prevents galling (sticking) between skewer and harder surfaces such as titanium
Our skewers are machined with a small groove on the inside face of the head, providing a mechanism for constraining unwanted axial motion of a washer. The washer will spin freely when pressed into the groove but will not come off with any shaking or vibrations within the realm of normal use, wear, and tear.
Compatibility: For use with all PMW 12 mm front and rear skewers EXCEPT Syntace