20" SINGLE NEEDLE 4-STEP ZIG-ZAG, WALKING FOOT This is one tough Reliable sewing machine for sail making and other heavy-duty zig-zag work. For medium to heavy weight fabric that requires a longer bed plate and a 3-step zig-zag stitch, we recommend the 2850ZW with top and bottom feed and a high-pressure foot lift. QUALITY YOU CAN COUNT ON For sewing sails, leather, canvas, and synthetics, the 2850ZW with stitch width up to 10 mm offers the whole package. Low noise and vibration design, outstanding build quality and reliability and the industry's #1 DC servomotor.