BromeMega 600 Metal Tube Feeder w/6 Seed Ports, 4 lbs seed capacity

What are the dimensions of the feeder (not including the hanger)? Amazon only shows the "package dimensions" which is not useful.

Will this feeder work well with just white proso millet?

Will this feeder work for “wild bird food” or only seeds?

Will cardinals feed from it? The ports seem very recessed.