Big Foot Presser Foot is a giant darning foot designed to give you more control when free motion quilting. Made of clear Lexon so you get a 360-degree visibility so you can see where you're going and where you've been! You have more contact with the fabric sandwich which will give you better stitch control. Sew at a steady, medium speed. From the center of the unique "T" shaped slot it is approximately 1/4 inch to either end of the "T" slot. This provides a guide for echo quilting. For Pfaff and other low shank machines.