EVERY ARCH IS INDIVIDUALLY CONSTRUCTED , THE FRAME IS BUILD WITH ALUMINUM PIPE 2 INCH DIAMETER . IT PROVIDES AREA FOR MOUNTING ACCESSORIES DUE TO THE DESIGN IT CONCEAL ALL WIRING AND EQUIPMENT MOUNTING BOLTS , THE TOP CAN BE BUILD IN DIFFERENT SIZES AT CUSTOMER SPECIFICATIONS TO PROVIDE MORE SHADE WITH ANY COLOR CANVAS. POWDER COATED,MOUNTING HARDWARE AND BACKING PLATES INCLUDED.