Secondary flare: It is a flat plane superimposed peripherally to the primary flare. Advantages are:Secondary flare ensures cavosurface margins to extend into embrasures (self-cleansing area). Permits easy burnishing and finishing of the restoration. Produces more obtuse-angled and stronger cavosurface margin.In class II cast gold inlay, proximal box should have flares so as to have the metal of 30-40° which is burnishable.