A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-580-0612
NSN 5855-01-364-8193
NSN 5910-01-399-6083
NSN 6685-01-251-2641
NSN 6620-01-432-5907
NSN 6110-01-497-5430
NSN 5945-01-298-5087
NSN 6610-01-354-3087
NSN 5998-00-845-4873
NSN 6610-01-409-1781
NSN 6130-00-833-3133
NSN 5945-01-213-0731