Duo-tone Power Extension SDM (Large Diameter) 42cm. You can easily set the sail by clicking the lever. Fine adjustments and on-the-water adjustments are also possible. It has been used, but the gears, pulleys, and cleats function without any problems. It is used, so please check the photos before making a purchase. It is also listed on other flea market sites, so please forgive us if it has already been sold.