High quality machine feet for industrial* sewing machines (not home sewing machines). These feet are ideal for sewing invisible zippers. Two different styles: S518 (flat front) and S518NE (with guide). Made in Taiwan. These feet are compatible with many Juki, Brother, Singer, Pfaff, and other brands of industrial sewing machines with a screw attachment (not snap on). To be sure your machine is compatible with this foot, you can measure the vertical shank of a foot you already have for your machine. It should be just under 1 1/4" long. Or, put the presser foot all the way down and measure from the shank screw to the table -- it should be about a 1" distance. This size is called a high shank machine, and happens to be the most common industrial machine foot used in the US. *Industrial sewing machines are set into a table and have a separate large and powerful motor.