THIS SHELF INCLUDES MOUNTING BRACKETS FOR INSTALLATION ON SLOTTED UPRIGHTS OF BASIC EXPANDABLE MODULAR WORKBENCHES (SOLD SEPARATELY). IT CAN BE MOUNTED AT ANY HEIGHT ALONG UPRIGHT COLUMNS FOR EASY HEIGHT ADJUSTMENTS. THE SHELF PROVIDES OVERHEAD STORAGE SPACE FOR WORKSTATIONS. THIS 12'D SHELF IS MADE OF STEEL. THIS PRODUCT IS MADE IN USA.