Walthers Nylon Round Head Machine Screws are perfect for your models and for any other model or device that needs miniature insulating screws. Walthers hardware offers matching nuts, as well as washers, hex wrenches, taps and other miniature hardware and tools in standard small sizes. Nylon Round Head Machine Screws are part of the selection of Walthers miniature hardware and tools. Machine and wood screws may be brass or brass plated.