A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-493-3102
NSN 6240-01-159-8314
NSN 5855-00-167-7893
NSN 5835-00-113-6090
NSN 5945-00-032-1308
NSN 5999-01-644-4543
NSN 5910-01-478-6232
NSN 6620-01-288-8249
NSN 6645-01-368-0399
NSN 5930-01-042-0148
NSN 6645-01-654-5293
NSN 6150-01-564-3010