A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-592-6248
NSN 5945-01-023-5097
NSN 6685-01-047-6695
NSN 5930-01-555-3401
NSN 6145-01-421-5109
NSN 5985-01-483-1042
NSN 7035-01-516-2655
NSN 4140-01-586-2210
NSN 5905-01-475-2338
NSN 6620-00-192-4855
NSN 5855-01-056-9607
NSN 5855-01-305-6101