Compatible with all Worx Landroid robotic lawnmower models When should you replace the knives?. S450i, S500i, M500, M500B, M800, M800i, M1000i, L2000i, L1500i, M1200i, S 450 i, S 500 i, M 500, M 500 B, M 800, M 800 i, M 1000 i, L 2000 i, L 1500i, M 1200 i.
