The Good Directions 401AL Adjustable Aluminum Weathervane Roof Mount is constructed of durable aluminum to be as long lasting as your weathervane. The roof mount is designed for standard and small weathervanes and accepts up to 3/4" diameter weathervane poles. This roof mount is 12-Inch long, 7-Inch high, 4-Inch wide and its mounting plates measure: 3-3/4-Inch x 3-3/4-Inch with 4 mounting holes per plate. Stainless steel screws for mounting are included.