License Plate Bolt Covers Chrome Plastic Spinners. How about a nice set of chrome spinner covers to hide the screw heads on your license plate? Or, you might have another use for them? These are for the #8 shank size. The total OD is about 1 1/4". Just screw on the spinner and then snap on the cap. Sorry about the camera reflection. I couldn't figure out how to eliminate it! The listing is for four. The dime is for size reference and not included. The listing is for 4 covers as shown.