This sewing machine is made of cast iron and is sturdy. It is a model known for its strength in sewing thick materials, and is often used for dressmaking, alterations, and the like. It is also known for its beautiful stitches, making it a well-regarded machine. Cast iron industrial sewing machines have incredibly stable stitches and can sew from thin to thick materials. This Brother industrial zigzag sewing machine, model TZ1-B651, is an early model, and has a double upper thread tension, which stabilizes the upper thread tension even with threads that tend to twist. Zigzag stitching is common on home sewing machines, but industrial zigzag sewing machines are no longer produced domestically. However, they are still widely used in dressmaking shops and alteration shops, making them a rare machine that is not widely known. It can also be used for core stitching, bar tacking, decorative stitching, and name embroidery. *When listing, I tested it with a size 11 needle and 60-weight thread on kimono fabric (Oshima Tsumugi) using upper thread (natural) and lower thread (red) for a 5mm width (see photos). (Accessories) Everything in the photos. * The needle plate, presser foot, and feed dog are all genuine Brother 5mm width accessories. * 5 bobbins are included, and other items (see photos). * The TZ1-B651 instruction manual is included on an SD card with photos copied onto it. * The handwheel has been painted black. * This is a listing for the sewing machine head only; it cannot be used without a sewing machine table and motor. * If you own a sewing machine model 【TA2-B621】, 【TA2-B623】, 【TZ1-B651】, or 【TZ1-B652】, the table size is the same, so you can swap the machine head. * Sewing machine bottom size: 18 cm x 40 cm (2 cm round) * If you have any questions or concerns, please feel free to ask. * Please check the photos carefully and understand the condition of the product before purchasing.