1 1/2 openings let songbirds in and keeps pesky squirrels out. The feeder can be hung or pole mounted. Wire bottom prevents debris build-up and there is not a collection area for attracting squirrels. UV stabilized polycarbonate tube; stainless steel wire; spring clamp; sheltering dome 14 3/4 cover 20 long 10 diameter. Made in the usa and covered by the droll yankees lifetime warranty. Size is 20 Inch. Dimensions are 20 X 8.5 X 8.5 UPC Code = 021964200756