This Trimmer has a unique lightweight aluminum alloy extrusion that provides a rugged, rustproof framework for the cutting blades. This blade framework is so strong that it has a lifetime guarantee. The unique saber shaped, non-clogging stainless steel blades never need sharpening. Our trimmers eliminate excess vine growth, open canopies for better air circulation and greatly improve spray and dust penetration. The P2200 Series is our most popular trimmers as they all trim two half rows.