A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-486-6750
NSN 5998-01-265-0244
NSN 5895-01-222-5822
NSN 5996-01-287-8311
NSN 6240-00-696-0249
NSN 5920-01-127-0252
NSN 5930-01-434-8438
NSN 5905-01-606-9978
NSN 5835-00-419-0575
NSN 6220-01-442-8707
NSN 5855-01-136-9532
NSN 6240-01-209-5321