A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-419-4215
NSN 5925-01-495-0602
NSN 6320-01-530-0588
NSN 5895-01-056-4548
NSN 6130-01-246-4154
NSN 5935-00-144-8017
NSN 6105-01-353-9763
NSN 5930-01-497-6859
NSN 5950-01-536-0641
NSN 6145-01-289-6199
NSN 6610-01-189-3001
NSN 5905-01-472-5982