A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-470-3219
NSN 5960-01-632-6576
NSN 5905-00-617-5102
NSN 6620-00-613-3023
NSN 5999-01-133-4540
NSN 6150-01-124-2626
NSN 6135-01-602-8383
NSN 6110-01-442-9397
NSN 4140-01-377-5828
NSN 5930-01-366-5045
NSN 5915-00-547-2520
NSN 5999-00-570-5530