A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-725-0016
NSN 5965-01-269-4338
NSN 6645-01-100-3296
NSN 5915-01-426-8862
NSN 5855-01-448-9794
NSN 5905-01-049-4710
NSN 6685-01-441-9378
NSN 5975-01-553-0371
NSN 6320-00-456-0836
NSN 2925-01-041-8201
NSN 6220-01-555-1543
NSN 5950-01-431-2071