Plastic Lining Additional Nozzles Cylindrical Moldboards layered with high density polyethylene plate for better soil scouring.  Plowshare made with alloy steel for wear resistance and longer positive penetration. Optional Plowshare chrome alloy tip, recommended only for highly abrasive sandy soils.  Moldboard trip system with flat spring mounted on each moldboard to prevent damage. When a rock, root or stump is hit, the moldboard will flip back and return to normal position of working when the implement is raised.  Ajustable depth control wheel made with segmented tire.  Modern extra strength...