A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-252-5743
NSN 6110-01-282-9110
NSN 5945-00-902-2391
NSN 6110-01-483-2166
NSN 6620-01-201-8221
NSN 6620-01-495-7446
NSN 6110-00-153-5395
NSN 6135-00-686-4777
NSN 6105-01-643-0555
NSN 5925-00-111-1969
NSN 7035-01-077-6041
NSN 5985-01-513-3010