A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-351-3220
NSN 6105-01-214-2396
NSN 5935-01-410-7742
NSN 6620-01-475-4717
NSN 5905-01-263-4944
NSN 6110-01-251-3749
NSN 5895-01-650-1358
NSN 5965-00-855-4500
NSN 6220-01-248-5298
NSN 6130-01-435-6140
NSN 6220-01-522-0013
NSN 6650-01-414-6196