Tightens your awning canopy while you're camping; supports your awning roller while you're traveling! Automatically cradles and supports roller as awning is rolled up, to eliminate flex and bounce as you travel. Installs permanently to the side of your RV. Note: Not recommended for use with metal wrap awnings. Note: Rafters do not safeguard awnings from water pooling. Use rain release setting to provide for water run off.