A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-361-4905
NSN 6620-01-436-5661
NSN 5895-01-197-2930
NSN 5925-01-044-0576
NSN 5930-01-055-8133
NSN 5998-01-539-9988
NSN 6135-01-321-5659
NSN 5910-01-337-4921
NSN 5999-00-409-1526
NSN 5998-00-139-5256
NSN 5905-01-109-2152
NSN 6610-01-281-6764