Usage Tips:Premium Stainless Steel ConstructionCrafted from SUS420J2 stainless steel, this blade offers exceptional hardness and durability, ensuring long-lasting performance Corrosion & Rust ResistantDesigned to withstand harsh outdoor conditions, the blade is highly resistant to corrosion and rust, making it perfect for prolonged use Integrated One-Piece DesignFeatures a one-piece molded construction for easy installation, ensuring a secure fit with Stihl/Viking robotic mower Precision CraftsmanshipEngineered with smooth, burr-free edges for enhanced durability and reliability, offering a flawless cutting experience Sharp Brushed Edge DesignEquipped with a finely brushed cutting edge, the blade remains sharp and wear-resistant, providing efficient and rapid grass trimming Specifications: Material: Stainless steel 420J2 Dimensions: Length: 20cm Hole distance: 9.5cm Hole diameter: large hole 8*16mm, small hole 8*10mm Applicable: For Stihl: RMI 422, RMI422 P, RMI 422 PCRMI 522 C For Viking: iMow MI4 Series Package included: 2 x Cutting Blades Other things not included