X-36470/18P… Decorative Screw Caps for Exposed Screws In Brass Nylon lock washer seats flat head screws from size 8 to size 14 screws. Put screw through washer then snap cap over that precision cast poly washer. Now exposed screw has become an aesthetic feature. Decorative cap is 11/16″ in diameter by 3/16″ thick. Sold by the Each.