A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-00-806-9952
NSN 6320-00-588-2401
NSN 6220-00-751-9709
NSN 5930-01-366-3262
NSN 6150-00-528-4175
NSN 5965-00-485-9575
NSN 6135-00-937-4118
NSN 5975-01-227-5543
NSN 5855-01-646-3965
NSN 6240-00-456-2578
NSN 5935-00-830-6934
NSN 5996-01-200-7282