A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-803-3290
NSN 5905-01-605-1569
NSN 5855-01-398-9548
NSN 6150-01-137-6150
NSN 5920-00-629-0442
NSN 5985-01-012-1682
NSN 6320-01-249-0598
NSN 6610-01-406-4985
NSN 5910-01-093-7034
NSN 6130-01-468-0166
NSN 2925-01-485-8304
NSN 4140-01-259-5828