Butterfly Household Sewing Machine Head,

Design: Durable, all-metal cast iron construction.Operation: Can be operated manually (hand cranked), via a treadle stand, or potentially converted with an electric motor.Stitching: Features an oscillating shuttle type and provides adjustable stitch lengths (typically 6 to 30 stitches per 25 mm).Convenience: Includes a built-in bobbin winder and a manual handwheel.