A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-258-5315
NSN 6620-01-600-7483
NSN 6150-01-317-3639
NSN 6110-01-382-9706
NSN 6610-01-502-8868
NSN 5960-00-661-0477
NSN 6135-00-334-4500
NSN 5905-01-657-2522
NSN 5895-01-184-9515
NSN 6240-00-985-3316
NSN 5985-00-717-6508
NSN 5990-00-608-3064