Yes, it's complete. Bar the instructions, which I don't see, but the stitcher itself is entire.
FYI, they can be used with *any* machine, as long as it has a screw hole on the bed for a seam guide-that's where this screws into. (With the right hand screw, in the square.) The square piece slides back and forth along the stem, so your circles can be any size. The button on the left end covers a short spike, like a thumb tack. The fabric gets stuck on there, in the center of the circle, and you put the button back on so you don't poke yourself. Then put the foot down and sew-the fabric will spin in place on the spike and you'll get a circle.
It does take some practice, but is fairly easy to get the hang of, and really does make great circles!