A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-389-8884
NSN 5935-01-361-2595
NSN 5945-00-200-9337
NSN 6685-01-447-2226
NSN 5935-01-391-5298
NSN 5990-00-115-2374
NSN 5855-00-631-4565
NSN 6220-01-634-0660
NSN 4140-00-113-8215
NSN 5925-01-112-5405
NSN 6105-00-104-6289
NSN 6320-01-397-9995