A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-262-0183
NSN 6130-01-020-7307
NSN 5996-01-112-6542
NSN 5925-01-643-5412
NSN 5975-01-351-5249
NSN 6110-00-594-7640
NSN 5985-01-225-5536
NSN 6135-01-582-2589
NSN 5975-01-044-6002
NSN 6610-01-192-6478
NSN 5935-00-624-7751
NSN 5935-01-507-2984