A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-334-4500
NSN 5935-00-627-9778
NSN 5975-01-473-0076
NSN 7035-01-516-2655
NSN 5960-01-263-1641
NSN 5960-01-122-1101
NSN 5920-01-221-0510
NSN 6650-00-443-4292
NSN 5985-01-075-7467
NSN 5915-01-049-0241
NSN 5905-01-432-4226
NSN 6320-00-336-9123