A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-01-057-5697
NSN 5985-01-071-4386
NSN 5998-01-569-5701
NSN 5910-01-428-7105
NSN 5935-01-474-6361
NSN 6645-01-489-5426
NSN 5960-01-453-0999
NSN 5965-00-636-4926
NSN 5915-00-259-3772
NSN 5935-01-413-6273
NSN 5975-01-655-9226
NSN 5999-00-639-3447