A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-640-9971
NSN 6105-01-531-6466
NSN 6130-01-559-1062
NSN 6240-01-304-2798
NSN 5915-01-188-8314
NSN 5855-01-424-2769
NSN 6620-01-476-7355
NSN 5975-00-179-0302
NSN 2925-01-197-7864
NSN 5985-01-385-9440
NSN 5925-00-236-5657
NSN 6320-01-457-9059