Application and CompatibilityFor models such as: S300 S500i M500 M700 M1000 M1000i M1200i L1500 L1500i L2000i ID B M800i M900 S500i S Basic S4 50i S7 00i, s WR130E M WR141E M WR142E3E M WR 1453E M WR 1453E M WR 1453E M WR 1453E etc. PREMIUM MATERIAL: Made of premium stainless steel with titanium coating. Titanium coating provides excellent rust resistance, good wear resistance and long service life. Most Precise Cutting Results Enjoy a unique and consistent smooth cut: Our replacement blades are specially hardened, specially sharpened and cut more precisely than ever. Superior quality and durable: Replacement robot lawn mower blades are finely polished, extremely thin and sharp - 1 mm thick. And equip new Dacromet screws. These blades do not require frequent changing. They won't rust, break or stay sharp for a long time. High Safety - Replacement blade for robot mower - Thanks to the premium material, these blades are harder to break. Even if the blade is on resistances (stones, etc.). Ideal for pet and child safety