... be parallel with the axes. NK NKS RNA49 RNA48 RNA59 Double Edge Match of Outer Ring, Single Line, Without Inner Ring NKI ... NKIS NA49 NA48 NA59 Double Edge Match of Outer Ring, Single Line, With Inner Ring RNA69 ... Double Edge Match of Outer Ring, Double Lines, Without Inner Ring NA69 Double Edge Match of Outer Ring, Double Lines, With Inner ...