A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-137-7848
NSN 6145-00-115-6355
NSN 6685-01-411-5286
NSN 5915-01-382-9383
NSN 5960-01-089-8155
NSN 6145-01-311-0061
NSN 6105-01-554-9764
NSN 5998-00-137-4149
NSN 5920-00-119-1406
NSN 6135-00-175-1279
NSN 5975-00-558-2495
NSN 6645-01-593-1679