Morton Machine Works manufactures a full line of precision thumb screws made from steel, stainless steel, and brass. The thumb screws are made in a variety of styles and designs to help meet all your requirements. Thread sizes are available in both Inch and Metric starting at 4-40 and M3... all the way through 1/2-13 and M12. If you don't see the size that you need, let us know and Morton will quote specials per your print design.