A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-332-5815
NSN 6240-01-327-9336
NSN 5915-00-220-9912
NSN 5990-01-588-3999
NSN 5835-01-312-4446
NSN 6130-01-142-1308
NSN 6135-01-171-9299
NSN 5930-01-624-7454
NSN 6105-01-028-2234
NSN 6320-01-582-6668
NSN 5998-01-077-2523
NSN 7035-00-574-4223