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Types of Truck Keys Finding a replacement key much simpler when you know what kind of key it is. Here's a look into the various kinds of keys and the features. This key looks like any other key, however it is equipped with a chip that can prevent theft of vehicles. This chip is used to initiate the vehicle. Transponder Keys Transponder keys are similar to keys made of metal, but they have caps made of plastic, which house the transponder. This kind of key can be found on GM's Circle Plus ke