A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-00-486-1893
NSN 5915-01-198-9177
NSN 5950-01-576-6428
NSN 6220-01-099-6581
NSN 5915-01-449-5391
NSN 6105-00-249-4193
NSN 5945-01-292-2126
NSN 5975-01-015-7770
NSN 6685-00-134-2993
NSN 6320-00-831-2227
NSN 6130-00-476-6841
NSN 5910-00-107-2715