A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-217-6165
NSN 2925-01-477-8037
NSN 6105-01-652-1394
NSN 7035-01-561-5380
NSN 5920-01-050-7474
NSN 6110-01-542-8642
NSN 5915-00-298-1969
NSN 5950-01-003-8636
NSN 4140-01-482-5038
NSN 5895-00-925-2423
NSN 5925-01-579-6730
NSN 5925-00-706-9975