A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-425-6047
NSN 5965-01-476-6146
NSN 5975-01-214-5746
NSN 6685-00-968-8536
NSN 5998-00-382-9284
NSN 5905-01-585-8664
NSN 5930-01-074-3925
NSN 6145-01-318-0059
NSN 5999-01-411-5135
NSN 6130-01-184-3987
NSN 2925-01-069-5324
NSN 6620-01-221-9296