A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-122-3454
NSN 5985-00-854-0849
NSN 5905-00-426-8092
NSN 5855-01-642-6323
NSN 5835-00-823-6116
NSN 5920-01-205-2826
NSN 5985-01-272-8248
NSN 5950-00-466-4215
NSN 5998-00-903-4137
NSN 5945-01-607-0482
NSN 6610-01-593-2428
NSN 6320-00-070-4544