A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-219-1506
NSN 6240-01-374-1904
NSN 5910-01-294-6659
NSN 5999-01-441-2778
NSN 7035-01-514-2221
NSN 5925-01-626-3092
NSN 5950-01-310-2843
NSN 6135-01-026-9960
NSN 6145-01-003-9741
NSN 5910-01-204-6848
NSN 5835-01-027-1828
NSN 5965-01-462-8230