This is the bolt version number plate reverse camera. Simply drill a small hole on the underside of your number plate ledge for the bolt of the camera to fit through. Then fasten to vehicle with the special split type nut provided. The result is a very small camera that is quite hard to even see! We have had this made by the same factory that makes our upgraded brake light cameras. Using their high quality PC4089 700TVL sensor and fully glass composite lens combination.