A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-429-0881
NSN 5925-01-608-6858
NSN 5905-00-341-6516
NSN 6135-00-958-7981
NSN 5965-00-402-7799
NSN 6145-00-249-6636
NSN 5925-01-323-7756
NSN 5950-01-035-6836
NSN 6145-00-110-2536
NSN 5975-00-529-3835
NSN 5965-00-111-2073
NSN 6320-01-139-0533