A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-420-5072
NSN 7035-00-834-2090
NSN 5985-01-446-5950
NSN 5855-01-254-6826
NSN 5945-01-224-7610
NSN 5996-00-100-4932
NSN 6135-00-798-1425
NSN 6135-00-900-2139
NSN 6320-01-462-3555
NSN 5930-01-189-2545
NSN 5965-00-763-5538
NSN 6320-01-495-1244