A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-555-3354
NSN 5920-00-669-9868
NSN 5985-01-111-8755
NSN 5925-01-406-4093
NSN 4140-00-841-5905
NSN 6150-01-653-6218
NSN 5965-01-657-3412
NSN 6610-01-250-2811
NSN 5910-01-227-5744
NSN 6110-01-387-8965
NSN 6685-00-924-7446
NSN 6150-01-465-3836