Don't forget about the strike plate. Most crooks are crude in their methods and simply kick in the door. Almost all door systems fail at the strike plate. Most strike plates that come with locks are small and the screws are short. You need a heavy duty strike plate with four screw holes. These are the longer strike plates with offset screw holes. You also need four inch screws to penetrate the actual house framing. This does not guarantee success but most burglars will find an easier target if the first two or three kicks don't get them in.