Sew Steady's Ruler Base is ideal for providing extra workspace on your machine while it's sitting on a frame with a platform. This extra space will help provide you with stability when using rulers, guides, and templates. For this ruler base to work with your machine, your long arm must rest on a carriage platform, not on rails, i.e., Q'nique machines. Without the platform, there is no place to support the table. Included with your custom-made ruler base, you get four height adjustable legs.