I purchased these because the bobbin winder on an old 1910 Singer 66 sewing machine would not fit what everyone advertised. Those are 5/8, but the bobbin friction wheel is 3/4". I went with a 30mm outside diameter and an inside diameter of 22mm, and they fit well. It's the only "replacement" friction wheel I could find, and it works.

There's really nothing wrong with them, ordered to replace some that were torn in my water cooled PC, but turned out to be the wrong size. I'll find some use for them eventually. (EKWB HDC 16mm OD fittings use M1.5x16 if anyone else is looking for the right size)

Let's see... Honda only sells this O-ring as part of a $15.00 + parts pack. Yamaha sells one for $1.49. This was a no-brainer. I gave a bunch to a buddy and still have plenty left over. Works as well as the OEM O-Ring I lost during my last carb rebuild. No leaks.

RELOADERS REJOICE! Are your Hornady Lock N' Load bushings allowing the dies to pop out of your press from time to time? Is it especially problematic for your powder measure? These O-Rings are the answer. Sure Hornady will send you a metal shim that supposedly corrects the "slippage" problem, but these work so much better and actually fixes the problem cheaply once and for all. They are slightly thicker than the standard Hornady O-Ring that come on the bushings and assure a tight fit with no movement. These are the rings Hornady should have used in the first place. And at this price for 100 O-Rings and two day shipping with Amazon Prime... how can you go wrong? Life is too short for "good enough" or "workarounds" Just buy them... you will not regret it.

Plain and simple these little guys worked. I used 8 of them to replace old flat ones from the carb on my motorcycle. The OEM o-rings are 3-4x as expensive and are the same thing. I would buy them again in a heartbeat, though I doubt I'll need to as i now have an extra 92 of them.