4. Thick support main bar, not easy to bend, use time longer. 1. Movable fixed bolt, easy to install and remove, very practical. 3. Adjustable threshing teeth, when encountered with smaller corn, can be used to clamp the blade, bending pressure. 2. Steel ball slide track, simple operation, old people and children can use. 5. Wooden handle, comfortable grip, anti-skid and moisture-proof, strong ability to absorb sweat.