Expanded Metal on 3 sides extends 48' high above deck to help contain loads and improve visibility and airflow. Shelves are adjustable on 3-1/2' centers for versatility, and can be positioned with 1-1/2' lips either up or down. Shelves are 12 gauge steel. 6' x 2' casters, 2 swivel, 2 rigid. Overall height is 57'. Additional factory installed adjustable shelves are also available.