I don’t know the official name. We just call it the crusher. We are getting 12-14 inches deep. Will crush/pulverize and rock that it can grab and push against the crush plate. Larger rocks that it can’t grab, you have to float over the top of. Have not had any compaction issues yet. We did put first plots about 5 years ago with the same machine. It does change your soil dynamics a lot. Have to add more lime and fertilizer.