This 18 1/2" tray is deigned to mount on a 1" diameter pole and holds 1 lb. seed. The platform attracts a wide variety of birds, including ground feeders, and catches spilled seed when mounted below a feeder. It also is a highly effective squirrel guard when placed 4’ or more from the ground and 8’ from trees or buildings. UV-stabilized polycarbonate to protect against the sun’s damaging rays. Includes Complete Clamp (#17 CC1) for mounting. Lifetime Warranty against squirrel damage.