This product from Droll Yankees acts as an 18 inch seed tray and squirrel baffel.  Exclusively designed for pole mounting (fits 1-inch round pole). Supported by a complete clamp (included), it acts as a squirrel guard when placed 4 feet or more from the ground and 8 feet from trees or buildings. This item makes a great cardinal tray.

Specs: 18.5" Diameter, Fits 1 inch diameter pole.