General Motors manufacture their vehicle make and models alongside the license plate screws that fit the vehicles they manufacture. The screws are pretty different from those of other carmakers and models. The GMC license plate screw uses Hex screws of 1/4” x 3/4 “with a head size of 3/8”. This screw is uniquely made for GMC and may not fit into holding the license plate of another vehicle make or model in place. If you bought a new GMC and need to attach your car’s license plate, there you have the required size of license plate screws to help you hold it in place.