This easily attaches to your machine and allows you a larger surface under the quilt sandwich in order to rest your rulers and do accurate work. The part is metal for durability and has a camera cutout so it will not block the camera on your machine if you have one. This is also called an Extended Throat Plate. This one with two oil holes fits the 18″ size machines only.
IT WILL NOT FIT THE CLASSIC OR THE OPTIMUM OR THE SUPREME