A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-139-3234
NSN 6105-01-392-5036
NSN 6620-01-610-5081
NSN 5895-00-155-8581
NSN 5996-01-067-8303
NSN 6145-01-459-4472
NSN 5920-01-091-7759
NSN 5855-01-254-3110
NSN 6650-01-066-0420
NSN 5915-00-237-5153
NSN 6135-01-086-0809
NSN 5915-01-364-7917