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Key Blanks For Your Truck All blank keys for trucks in one place. Simply select the manufacturer of your vehicle from the left column and view all the possible key blank options. They look like keys made of metal however the top is made of plastic, and houses a transponder. Truck drivers prefer them. They lower the risk of theft by reducing the likelihood of accidental duplicates. Transponder Keys A transponder key, also known as a chip-key, is fitted with a microchip which transmits a unique code signal