Made with Multi-function Machine, this Special square Nut is made larger than M2.0 in thread. The material that it is made from could be various, such as steel, stainless steel, copper, brass, bronze, aluminum, etc. The surface treatment could be different according to customers' requirement, like nickel plating, zinc plating, chrome plating, black oxide, anodize, paint coating, powder coating, etc. The Special Square Nut is usually used on machinery.