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 5960-00-104-2740
NSN 5945-00-347-0531
NSN 6645-01-564-7129
NSN 6320-01-651-7476
NSN 5998-00-405-5272
NSN 6650-01-462-0474
NSN 6620-01-444-7053
NSN 6650-01-517-9452
NSN 6105-01-634-0322
NSN 5975-01-368-3828
NSN 5910-00-227-9795
NSN 6135-01-483-5269