There is nothing cooler than a mean looking car with frenched headlights. Frenching is the act of recessing or moulding a headlight, taillight, antenna or license plate into a car body to give a smoother look to the vehicle. The name originates from the end result looking like a French cuff of a shirt sleeve, which has a ridge at the end. This modification has been used on leadsleds and customs since the 1930s.
Frenching a headlight or taillight is done in one of two ways: either removing the bezel, mounting the light deeper in the car's head or taillight recess and using the headlight rings from another car (or an aftermarket kit) to mount it deeper into the body. It can also be done by modifying the light's mountings so that they can be removed from behind, welding the bezel to the body once the chrome plating is removed and painting it body color. This gives the effect of visually lengthening the car, as well as smoothing out the body. Many customs have lights from another car transplanted in place of the original factory items, but even these are frenched as well.