A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-185-4020
NSN 6150-01-038-6612
NSN 6610-01-233-0949
NSN 5945-01-088-2496
NSN 5895-01-154-0005
NSN 5930-01-658-0160
NSN 6145-01-400-3838
NSN 5915-00-285-2213
NSN 5975-01-536-4400
NSN 5985-00-814-5184
NSN 5990-00-319-0811
NSN 5935-01-023-9366