These teflon rings are for use with solid axle systems only. One size fits all three solid axle nuts (M10, M9, and 3/8″.) If you need to replace parts for your 5mm quick release skewer, please purchase a replacement teflon ring set, or buy a bundled teflon and lockring set and save.
Each set of Pitlock’s solid axle teflon rings include two rings.
While you replace your teflon rings, consider replacing your solid axle stepped washers as well. Both parts are intended to be wearing pieces, and are critical for the functionality of the locking mechanism.