Dixon Products Squirrel Master Baffle, Guaranteed to Stop Squirrel Raids on Bird Feeders Easily installs on any shape bird feeder pole in 10 minutes or less Wraps around the pole and installs using only a screwdriver. Fits round poles 3/8 inch to 1 3/8 inch diameter and square poles up to 1 inch. Weather proof galvanized steel and rubber construction, 23 L x 3.75 W Instructions and installation hardware included. Money-back satisfaction guarantee Made in the USA