A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-276-8835
NSN 5855-01-364-8193
NSN 6110-01-497-3343
NSN 6130-01-141-6001
NSN 6645-01-113-6712
NSN 5998-00-865-5040
NSN 5910-00-526-8005
NSN 5935-00-244-6065
NSN 5895-01-433-2447
NSN 6150-00-848-0359
NSN 6620-01-388-1430
NSN 6150-00-518-6651