PALM TREE Weathervane Complete Roof Mount Weathervane, v-shaped with apex flattened for welding of post attachment with securing screw. 4 screw holes to attach 2 to each side of roof. Suggest sealing with silicone after fastened securely. Powder Coat Baked On Finish, strong finish. Constructed out of 16 Gauge Steel, ample strength for any strong winds. Stainless Steel Sealed Ballbearing in the Windcup, spins nice and smooth. Interchangable Tops, welded sleeve fits over pin attached to post top.