Thank you for visiting this item. The front and back are adjustable. Also compatible with thick and thin fabrics. Includes 2 mounting screws. ◆ Sewing fabrics such as leather, laminate, cotton, and vinyl, suitable for most industrial and professional sewing machines. ◆Durable, sturdy, non-slip 1 screw mounting: Maximum range of 1.5 inches (38 mm) screws; 2 screws can be adjusted freely from 1.0 to 1.5 inches (25 to 0 to 38 mm). It cannot be attached to household sewing machines, but can be used with tape ★Please allow for slight differences in the measurements of amateurs. ★Please be reminded that due to lighting effects and monitors brightness/contrast settings etc, there could be some slight differences in the color of the item. ★The product is imported, so there may be slight scuffs, scratches, stains or sweetness of the workmanship during processing. Thank you for your understanding. ★Please be aware that it will be simple packaging during shipping.