SINGER 412U is a two-needle, lockstitch machine ideal for light to heavy-weight materials. It features adjustable stitch length, needle thread tension, and bobbin thread tension, allowing for precise control over the sewing process. The machine also has a built-in back tack switch for added convenience. With its easy-to-use controls and reliable performance, the SINGER 412U is a great choice for home sewers and small businesses alike.