This dense rubber T-Gasket is designed for solar arrays with top clamps and ideal for gaps from 8 mm / 5/16 inch up to 11.1 mm / 7/16 inch. Made from dense, UV-resistant EPDM rubber 24mm high and 24mm wide - it fits solar module frames of 25mm or more. This spool of 100 feet (30.5 meters) can cover an array of about 5kW