A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-429-0881
NSN 6610-01-167-0845
NSN 5910-01-142-5815
NSN 6220-01-596-1414
NSN 6240-01-361-8138
NSN 5950-01-377-8622
NSN 6135-00-628-1142
NSN 6150-00-894-1984
NSN 6110-01-599-3951
NSN 5965-00-905-6895
NSN 5895-01-381-1313
NSN 5895-00-039-7257