A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-610-9286
NSN 5950-01-607-1079
NSN 5965-00-125-1318
NSN 6220-01-390-0420
NSN 2925-01-415-0264
NSN 5855-01-203-4719
NSN 6110-01-546-3680
NSN 6145-00-802-2384
NSN 6645-00-199-3569
NSN 5835-01-412-6901
NSN 6320-01-415-0953
NSN 6320-01-134-7267