A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-528-7454
NSN 6685-00-248-1691
NSN 5950-01-485-3147
NSN 6220-00-062-7029
NSN 6610-01-300-1789
NSN 5945-01-346-0139
NSN 6150-00-712-8212
NSN 5990-01-189-9338
NSN 6610-01-315-7002
NSN 5950-01-062-6097
NSN 5975-00-422-8500
NSN 5975-01-489-6159