A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-00-410-8920
NSN 6620-01-508-0901
NSN 5975-00-097-0177
NSN 5915-00-205-6791
NSN 6130-00-898-5754
NSN 6150-00-481-4763
NSN 6620-01-197-7665
NSN 6135-01-204-8712
NSN 5945-00-955-0721
NSN 2925-00-373-8837
NSN 5950-01-600-2925
NSN 5998-01-148-1278