License Plate Bolt Covers Chrome 3/16" Plastic Covers. How about a nice set of chrome covers to hide the screw heads on your license plate? Here is enough to do front and rear. Or, you might have another use for them? These are for the 3/16" shank size. The chrome cap is about 5/8" OD. Just screw on the adaptor and then snap on the cap. The dime is for size reference and not included. The listing is for 8 covers as shown.