The spring tine rake penetrates much deeper into the soil than the spiked tine harrow. Due to its elastic action and the "bendability" of the teeth, the tine harrow is suitable for work on uneven or rocky ground, it can effectively loosen the soil and bring the clod to the ground for easy crushing, and it is also suitable for lawn cultivating operations.http://www.sungardentools.com/rakes/bow-rakes/