A small cylindrical, circular-like, nonmetallic item whose outer curved surface has a circumferential groove(s) to enable it to be self-retained when inserted in a hole.
NSN 5996-01-074-9603
NSN 6105-01-392-4222
NSN 6645-01-422-1374
NSN 5855-01-555-0579
NSN 6220-01-633-5105
NSN 6150-01-217-1509
NSN 5990-01-296-8190
NSN 5950-00-697-2608
NSN 5925-01-320-1609
NSN 5935-00-097-3970
NSN 6220-01-309-9146
NSN 7035-01-352-0766