If formed, Lightening holes have a flange which has a significant stiffening role. The usual shallow flanges at about 45° to the plane of the web result in a holed panel that has less shear strength (for buckling) than the solid web. However, some severely formed flanges, pushed right out to 90° to the web, can result in a web that is more resistant to buckling than the unholed solid web. However, forming these is quite hard.