The Pen Caddy hangs directly on your pig pen fence for easy access. The open supply box that is 18" long x 8" wide x 5" deep, hangs over the top into the pen so it will not protrude out into the aisle. The wire panel design allows the feeder to be attached at multiple heights. The tie-down chains prevent hogs from lifting the Pen Caddy off the fence. The hanger is 36" tall. Feeder sold separately.