A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-370-5818
NSN 5965-01-204-8505
NSN 5990-01-305-8121
NSN 5975-00-904-6348
NSN 5905-00-170-8370
NSN 6130-00-701-0029
NSN 6320-01-481-7322
NSN 5930-01-503-7412
NSN 7035-01-167-2241
NSN 5915-00-167-0306
NSN 6645-00-057-3499
NSN 5855-01-535-6275