Vane Rail? Features a pre-fab side rail eliminating layout time. ? Vanes can be quickly assembled to rails with only one blow of a ball peen hammer.? Manufactured of 24 gauge (.7 mm) galvanized steel.? Precision-stamped and slotted assuring uniform spacing of vanes.? Fastest, easiest, most economical construction of vane assemblies. ? Specially embossed to add strength and sturdiness to the finished section.? Duro Dyne Vane Rail is manufactured in the United States.