A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-489-6044
NSN 6105-01-563-1961
NSN 5999-01-447-4892
NSN 7035-00-009-8705
NSN 5925-00-275-0380
NSN 5999-01-240-8050
NSN 6240-00-275-1950
NSN 5945-00-163-3281
NSN 5950-00-727-3964
NSN 5985-01-595-1224
NSN 5930-01-197-6857
NSN 5920-00-455-9743