A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-00-518-4880
NSN 5975-00-518-1733
NSN 5835-00-764-4388
NSN 5910-00-871-3561
NSN 6650-01-433-3520
NSN 5935-01-048-2920
NSN 5905-00-277-7439
NSN 6685-00-147-3835
NSN 6130-01-088-8542
NSN 5996-00-466-2219
NSN 5930-01-569-4485
NSN 5965-00-493-6008