Grace Speed Control Box For Quilting Sewing Machine: Pfaff Grand Quilter Speed dial that allows you to set your machine to desired stitch speed. On/Off button to start and stop your machine. Easy to use knob controls stitching speed. Pulse Button machine runs until you release it, or touch and release for a single stitch. Thread Cutter Button activates your machine's thread cutter. (Only compatible with the Juki 98 series.) Sewing Machine not included. Velcro Straps for easy attachment to your frame. It is only compatible for Pfaff Grand Quilter