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Injection Molding is the way that manufacturers produce a plastic part of a product. Each mold is specific, and is made to fit different types of injectors. The actual Molds are made in different ways, mostly by CNC machining. A mold machine is made of two different parts one being the injector in the other being the clamping unit. Manufacturers use different types of machines that are made by different vendors, but many of them are interchangeable or can be retrofitted to work with other machines. The mold is held in place by the clamping unit, these clamping units are different for each machine depending on the type of injection being used, usually depending on size of the part being made.