AMFICO's alloy steel rigid electrical fittings surpass all other products for ease of use and strength. True, other companies pioneered the product but at AMERICAN FITTINGS we perfected it. While, many are going off shore to source and resell, we continue to make the best in the USA. Since our products are solid steel and are produced on CNC machines, you can count on consistency of wall thickness, uniform ID's and threads that thread easily but seal tight.