2 fully automatic 1-step buttonholes are also included for easy and secure button fastenings. In other ways the two machines are similar, including the use of a Class 15J bobbin and an LED light stitch pattern selector. A total of 30 stitch patterns are available that can all be adjusted for length and width, and the heavy duty metal frame construction of the machine helps to avoid skipped stitches. A number of standard accessories are included, including a replaceable foot for zippers, satin stitching, blind hem, and buttonholes. As seen in almost all Singer sewing machines, a screwdriver and foot pedal are also included.