A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-927-5436
NSN 5925-00-578-0479
NSN 6220-00-269-0459
NSN 6610-01-441-1581
NSN 5975-00-777-5256
NSN 5855-01-244-9785
NSN 6610-01-508-6272
NSN 5925-00-020-8917
NSN 5999-01-449-1248
NSN 5920-01-157-9471
NSN 5996-00-414-7558
NSN 6320-00-908-6841