Improved plastic of the original design originally used on my car. Easy to install if you have mechanical skills. You will need a Phillips screwdriver and standard size pliers. A NOTICE. There are short and long screws in the gray plastic housing. DO NOT mix them up or you will pierce the insides with a long screw in a short hole. My method is to put a small piece of masking tape next to the short screw holes to remind me where the short screws go. You can write "briefly” on the tape if necessary.