A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-408-5332
NSN 5985-00-603-5704
NSN 6320-00-937-5625
NSN 6620-01-535-6925
NSN 5996-01-184-7224
NSN 5935-01-393-8791
NSN 7035-01-485-7351
NSN 4140-01-363-6802
NSN 4140-01-411-7445
NSN 6320-01-280-5091
NSN 5998-00-033-3274
NSN 6610-01-300-8383