Designed for use in all soils except heavy scattered rock. Suitable for digging in small scattered rock or gravel. Can dig through asphalt or gravel driveways. However, trenching in sand, gravel and asphalt does reduce the life of all rotors. This 7" rotor costs more than the 5 point rotor but it should increase the life of therotor by 75% to 90%.
9" x 3" w/ 7 points