1.The arm length is 560mm, 300mm longer than ordinary flat seam,convenient rotary of large-area materials. 2.Automatic filling,automatic trimming,automatic fall back seam,automatic needle position,automatic presser foot(optional) . 3.High speed. 4.The size of the hook to choose from. 5.Stand of double column horse and foot pedal for selection. 6.Suitable for special models such as modified template machine.