A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-291-4173
NSN 5905-01-648-4896
NSN 2925-00-480-9068
NSN 5910-01-139-5085
NSN 5905-01-200-1116
NSN 6150-00-908-7407
NSN 6320-00-149-7570
NSN 6620-01-177-3779
NSN 6320-01-384-3850
NSN 5835-01-481-4204
NSN 5999-01-092-6967
NSN 5999-01-367-1612