The Alumacart Aluminum Wagon Side Walls are available as an optional accessory for all Alumacart wagon styles. Walls stand 8.5'' tall, fabricated using 4'' x 1'' aluminum channel for horizontal walls and 1'' x 1/8'' square aluminum tubing for wall uprights. Walls slide into ten aluminum receivers (1 1/4'' square tubes) that are bolted to the bed of the wagons with stainless steel hardware. Each side can be independently removed at any time.