A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-285-8466
NSN 5998-01-243-7986
NSN 6610-01-443-4055
NSN 5945-01-597-1734
NSN 5930-00-768-2779
NSN 5895-01-510-3517
NSN 6685-01-437-8603
NSN 6645-01-284-6533
NSN 5975-00-035-6524
NSN 6135-01-293-3066
NSN 6105-01-346-8337
NSN 7035-00-763-6180