A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-196-4855
NSN 6685-01-502-7648
NSN 6130-00-254-8337
NSN 5915-01-132-4255
NSN 6145-01-543-0124
NSN 5945-01-126-3695
NSN 5835-00-257-2852
NSN 6610-01-231-9283
NSN 6610-00-032-3536
NSN 5925-01-106-4498
NSN 2925-01-587-3956
NSN 5855-00-586-6255