This SINGERâ® CLASSIC HEAVY DUTY sewing machine is a true workhorse. It can sew through just about anything you throw at it. Convenience features add a new dimension of ease to heavy duty sewing. This SINGER 44S Classic Heavy Duty sewing machine features a powerful motor and an extra-high sewing speed (1,100 stitches per minute), allowing you to sew just about anything. The heavy duty metal interior frame and stainless steel bed plate is rugged and durable enough to withstand heavy usage. The SINGER 44S Classic Heavy Duty sewing machine includes. An automatic needle threader with a top drop-in bobbin system. 23 built-in stitches that are useful for creating a variety of embellishments, as well as standard stitching applications. 4 Sewing Feet: General Purpose Foot, Zipper Foot, Buttonhole Foot, Button Sewing Foot.