Jack F6-HL-7 - Power Saving, Direct Drive, Heavy-Weight Large Hook lockstitch Machine. The Jack F6 is an industrial lockstitch sewing machine engineered for high-speed performance, precision, and long-term durability, making it ideal for professional tailors and manufacturing workshops. It features an energy-efficient direct-drive servo motor, an automatic lubrication system, and a low-vibration design that ensures stable, consistent stitching at speeds of up to 4,000 RPM across a wide range of fabrics. Additional enhancements include an integrated LED work light, a direct-drive power system, and an automatic thread-trimming function.