A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-00-887-3793
NSN 6135-00-152-8729
NSN 6110-01-197-9093
NSN 6145-00-216-6613
NSN 5835-00-113-6090
NSN 5965-01-474-5654
NSN 5930-01-488-6687
NSN 5855-01-272-3660
NSN 6150-01-255-4760
NSN 6610-01-643-2315
NSN 6320-00-701-0437
NSN 5925-00-992-4963