A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-223-3399
NSN 6150-01-435-5026
NSN 6135-00-100-0485
NSN 5920-01-181-8210
NSN 5925-00-235-0046
NSN 5990-00-312-6787
NSN 6645-01-004-7768
NSN 5915-00-723-3709
NSN 6320-00-564-2772
NSN 5999-00-890-8451
NSN 5975-00-930-1621
NSN 5965-00-501-7835