A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-623-3603
NSN 5950-01-376-5368
NSN 5930-00-449-6969
NSN 5965-00-045-3440
NSN 5910-01-410-7151
NSN 6620-00-006-6418
NSN 5925-00-557-4530
NSN 5998-01-633-5311
NSN 6685-00-230-4267
NSN 5915-01-424-6958
NSN 5975-01-537-0956
NSN 5950-01-199-1710