A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-670-0396
NSN 5855-00-973-5717
NSN 5925-01-357-7180
NSN 5925-01-339-6540
NSN 5935-00-232-6700
NSN 5835-01-584-8538
NSN 6240-01-276-2019
NSN 6240-00-902-3121
NSN 5935-00-170-7173
NSN 5960-01-298-4143
NSN 6145-01-599-9935
NSN 5990-01-161-4625