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 6220-01-106-7845
NSN 5915-01-321-1406
NSN 5985-01-339-8662
NSN 5855-00-446-5921
NSN 6105-00-281-3928
NSN 6320-00-149-7570
NSN 5915-01-655-1413
NSN 4140-01-387-2068
NSN 6685-00-296-0392
NSN 6220-01-617-2632
NSN 6145-01-313-9873
NSN 5945-01-062-0800