A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-248-6688
NSN 2925-01-550-0177
NSN 6320-00-483-0451
NSN 5925-01-467-9910
NSN 6150-00-337-2790
NSN 5855-01-020-7982
NSN 5855-01-340-6541
NSN 6240-00-248-6517
NSN 6240-01-141-5230
NSN 6620-01-378-4108
NSN 5999-01-528-5643
NSN 5975-01-425-1268