A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-541-3957
NSN 2925-01-643-4472
NSN 6105-01-328-8511
NSN 6105-01-440-8922
NSN 5915-01-322-5342
NSN 5835-01-587-8787
NSN 5915-00-228-0114
NSN 6620-00-421-7509
NSN 5905-01-243-9852
NSN 7035-00-312-3055
NSN 5950-01-159-4148
NSN 6320-00-504-1214