A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-426-2220
NSN 5925-01-100-0636
NSN 5935-00-010-3002
NSN 6320-01-364-1840
NSN 2925-01-230-8057
NSN 5915-01-481-1954
NSN 5950-01-632-5304
NSN 5945-01-437-3454
NSN 5998-01-105-3398
NSN 5965-01-525-7513
NSN 5835-01-391-4556
NSN 6150-00-755-4852