Rakes are agricultural tools used for surface soil cultivation, with a cultivation depth generally not exceeding 15 centimeters. A flat rake is an uncommon agricultural tool mainly used to level the soft soil on the ground. It is usually used for seedling cultivation in the early stage of spring plowing. The flat rake evolved from the ordinary nail rake, which changed the nails at the front end to sloping wooden boards. In this way, leveling the land will be more lightweight and effective.