A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-070-4544
NSN 5835-00-351-9459
NSN 6320-01-335-8336
NSN 6320-01-119-3935
NSN 5965-00-929-9415
NSN 5855-00-896-4047
NSN 6130-01-295-8309
NSN 6240-01-609-7177
NSN 7035-00-897-7567
NSN 6135-00-231-7257
NSN 5999-01-371-7410
NSN 5920-01-458-5224