A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-555-6087
NSN 5925-00-196-6978
NSN 6320-00-468-8421
NSN 5915-01-398-3524
NSN 5930-01-290-2386
NSN 6105-00-079-0547
NSN 6240-01-059-3563
NSN 6105-01-138-4894
NSN 6110-01-629-9464
NSN 5895-01-439-7050
NSN 5985-00-865-7628
NSN 6610-01-173-3128