This category indexes sites of companies producing diecast parts and components for a wide variety of customers. The process is one of several different foundry operations and involves injecting molten metal, usually under pressure and often with water cooling, into a hardened steel die that conforms with the required shape. Subsequently, the die is opened and the casting rejected. Machining and finishing the raw casting may then follow, depending on the customer's requirement. On the whole, diecasting is confined to products made in aluminum, zinc, magnesium, and brass metals or alloys. Note: Where a company produces more than one type of casting, it more logically belongs in -- and should be directed to -- either the main Foundries category (which indexes firms with multiple capabilities) or the one that best matches the major portion of the company's output.