A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-065-1073
NSN 6650-00-583-1735
NSN 5999-01-535-0026
NSN 5915-01-386-3995
NSN 6150-00-673-4724
NSN 5910-00-270-6876
NSN 6135-01-364-0667
NSN 5835-01-468-6170
NSN 6220-00-103-3419
NSN 5996-01-172-3104
NSN 5855-00-130-5756
NSN 5996-01-630-8108