【Durable Material】: Sliding plate is made of wear-resistant and corrosion-resistant aluminium with a thickness of 1 mm and a diameter of 211 mm. Compatibility: This product is suitable for Husqvarna Automower 420 430X 440 450X, replaces original for Husqvarna: 587378001. Easy installation: simply install this disc on the plastic mower deck of your lawn mower. Package includes: one product. 【Recommendation】: Replace the discs of your lawnmower if you notice worn or damaged blades or if the discs are too worn to continue cutting effectively., Manufacturer: bruwaa