The Xtend Outdoors high quality Curved Roof Rafters prevent your awning fabric from flapping in the wind and avoids water pooling during rainy periods. These C-Clip Curved Roof Rafters are easy to set up and are suitable for awnings or porches, where one or both ends require a c-clip attachment. These also pair perfectly with an Anti-Flap Kit to keep your awning stable and safe.