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: 3.75″ x 3.75″ with 4 mounting holes per plate. Dimensions: 12″L x 4″W x 13″H. Weighs 2 lbs.