Question: what is the difference between singer heavy duty sewing machines?
Answer: The main difference between Singer 4452 and Singer Heavy Duty 4423 is stitching. Singer Heavy Duty 4423 comes with 23 built-in stitches which is a good number. ... Heavy Duty Stitch 4423 built-in stitching includes 6 basic stitches, 4 stitching stitches, 12 decorative stitching, and 1 step aperture.