A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-156-3697
NSN 6650-01-644-2547
NSN 5965-01-317-2944
NSN 5905-01-525-7357
NSN 5975-01-517-5237
NSN 5950-01-431-7311
NSN 5975-01-173-2511
NSN 5998-01-172-7466
NSN 5965-01-463-8176
NSN 5920-01-157-9471
NSN 5945-01-104-6453
NSN 6645-01-630-8831