Adjustable, aluminum roof mounting system with stainless steel screw to secure your weathervane. Most Weathervanes can be traditionally mounted to most roof tops using this ZGD401AL Roof Mount or the ZGD401LG Roof Mount, there are many other more contemporary and complimentary ways to display a weathervane including : Vinyl or Wood Cupolas, Eave Mounts, Display Bases, and Garden Poles. We would be happy to assist you in making your display and mounting decisions. Can be easily adjusted to fit your roof or cupola. Standard size weathervanes; accepts up to 3/4" diameter weathervane poles. Mounting plates measure: 3.75" x 3.75" with 4 mounting holes per plate.