A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-146-5804
NSN 5965-00-275-0491
NSN 5920-00-864-6622
NSN 6110-00-107-8524
NSN 5910-01-094-7391
NSN 6150-01-591-4403
NSN 5990-01-465-9235
NSN 6150-00-082-8249
NSN 4140-00-451-8374
NSN 6105-01-512-7032
NSN 6105-00-011-8083
NSN 6130-01-651-4799