Automatically extends with your slideroom. Built-in automatic roller lock prevents billowing. Helps keep leaves dirt & debris off your slideroom. Roller tube and mounting brackets are heavy-duty extruded aluminum. Order brackets & hardware separately. Actual length of slideout cover (endcap to endcap) measures approximately 5 Longer than the fabric width. Automatically extends with your slideroom. Built-in automatic roller lock prevents billowing. Helps keep leaves dirt & debris off your slideroom. Roller tube and mounting brackets are heavy-duty extruded aluminum.