The harrows are adopted a whole frame made of quadrangular steel tubes by welding, So their structures are simple and reasonable, strong and durable. Their processes are perfect. The bearing is ball bearing with sphere-outside and square-inside, its rated load is large, trailing resistance is small, sealing is good. Theyre convenient to operate and maintain. Efficient in pulverizing and penetrating into the soil and leaves the land with a smooth, even tilth. All these satisfy the agricultural requirements of intensive cultivation.