A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-259-7006
NSN 6105-01-385-8552
NSN 6135-01-230-4399
NSN 5996-01-381-9313
NSN 6240-01-296-8997
NSN 5930-01-391-5093
NSN 5835-01-460-6054
NSN 2925-01-565-4636
NSN 5999-01-542-9923
NSN 5965-01-109-2917
NSN 5855-01-593-7384
NSN 5960-01-439-3731