Resources Technical Support Defects Shape Defects Back Technical Support Shape Defects Edge Wave Edge wave occurs when the edges of a coil or plate are longer than the center of the coil/plate Coil Set Sheets with coil set will keep the shape of the coil after uncoiling instead of laying flat. Center Buckle Center buckle occurs when the center of the coil or plate are longer than the edges of the coil/plate. Crossbow Material with crossbow arcs across the width of the coil. Center Buckle Edge Wave Explore Our Resources Blog Brochures & Data Sheets Calculators Certifications &Compliance Documents Technical Support real people. real expertise. We're ready to help with solutions you can trust. contact us