The main use of rotary hammer drills is to frequently drill holes in the concrete. The Makita 1510W uses 1510W power and a no-load speed of 150-310 rpm. The Makita HR5202C comes with two new on/off switches that can be used in hammering mode. The rotary hammer drills are mainly used for heavy-duty drills such as drilling into mixed joint concrete, making holes into woods etc.