A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-106-0302
NSN 6610-01-004-2906
NSN 6610-01-167-8747
NSN 5910-00-545-7898
NSN 5835-01-447-2544
NSN 2925-01-468-7073
NSN 6320-01-094-2634
NSN 5999-01-025-6686
NSN 6645-00-928-7208
NSN 5915-01-010-3380
NSN 5925-00-392-6164
NSN 5895-00-876-6855