A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-248-6990
NSN 5835-01-267-3388
NSN 6320-01-376-2778
NSN 5910-01-158-5567
NSN 6240-01-041-7477
NSN 5945-01-171-0130
NSN 5950-00-361-8578
NSN 6620-01-058-3539
NSN 6145-01-076-8202
NSN 2925-01-591-4030
NSN 6220-01-513-5022
NSN 6620-00-635-7347