Helical brackets Pile Caps Shaft Size: 2 7/8 inch Tubular-0.203 inch wall,2 7/8 inch Tubular-0.262 inch wall, 3 1/2 inch Tubular-0.300 inch wall,4 1/2 inch Tubular-0.337 inch wall. Steel Plate: 8" x8"x0.5", 6"x6" x 0.375", etc We have our own factory here in China and quality meeting the specifications of our buyers, our prices are also very competitive than your present buy. For North American customers, door to door service is available. OEM service is available, different materials and specifications can be customized according to your demands. Please send us the detailed specifications of our helical piles, then we can supply the best quotation for you.