A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-571-0503
NSN 5999-01-546-9114
NSN 6645-01-115-4953
NSN 6610-01-609-3466
NSN 5965-01-490-6704
NSN 5895-00-226-5701
NSN 5925-01-090-4112
NSN 6620-01-401-5356
NSN 5855-01-472-2554
NSN 5985-01-572-9402
NSN 6320-00-456-0836
NSN 6620-01-457-9476