A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-502-0402
NSN 5930-01-371-4260
NSN 5935-01-364-0161
NSN 6105-01-216-7146
NSN 5950-00-079-0749
NSN 6620-01-335-5776
NSN 6620-01-121-4019
NSN 5910-00-959-8349
NSN 6685-01-029-3773
NSN 5905-01-569-6908
NSN 5935-01-533-6345
NSN 6220-01-041-2194