A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-129-5112
NSN 6135-01-048-0910
NSN 6110-01-287-8438
NSN 6220-01-335-0201
NSN 5950-00-630-0377
NSN 6220-01-102-6629
NSN 5985-00-875-6397
NSN 5930-00-676-8489
NSN 5975-00-868-4456
NSN 5935-01-508-4147
NSN 6220-01-459-5732
NSN 5985-00-549-9660