Durable Aluminum roof mount will be as long lasting as your weathervane Can be easily adjusted to fit your roof or cupola Fits Good Directions standard size weathervanes; accepts up to 3/4" diameter weathervane poles Mounting plates measure: 3-3/4-Inch x 3-3/4-Inch with 4 mounting holes per plate Dimensions: 12-Inch L x 4-Inch W x 7-Inch H