A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-551-8612
NSN 5975-01-170-2631
NSN 5935-01-158-6291
NSN 5905-01-251-3293
NSN 5960-01-364-1318
NSN 5915-01-148-0095
NSN 6240-01-030-1183
NSN 6650-01-148-5307
NSN 6320-00-186-6452
NSN 6150-00-288-6245
NSN 5998-01-027-7598
NSN 5950-01-007-9669