RF5550/8500/8700 high speed lockstitch sewing machine Applicable to sew the thin moderable thickness cotton,wool and chemical fiber fabrics light-weighted leather goods,well-designed,customised with perfect performance.The machine operates smoothly with character of low noise,endurability,nice appearance,and its automatic lubricating system and oil volume valve never make the cloth dirty.Satisfying the international standards.The machine can also use the general spare parts and accessories,which are convenient to users in purchasing.It is the ideal sewing machine for garment manufacturers,caps and shoes manufacturers.