Features: Enhances your robot mower's traction with these 205mm antislip spikes, crafted from synthetic resin to withstand rust and deliver year round stability on inclines. Featuring precise screws for seamless installation, these traction wheel spikes attach securely without protruding edges and remain fixed during wheel replacements. Ensuring consistent mowing performances on slippery terrain, rainy days, or damp grass while preventing wheel slippage across uneven surfaces. Includes 2 heavy duty anti skid spikes and 14 corrosion resistant screws to optimize grip in demanding conditions. Nonslip spikes provide better grip and stability. Can cope with any slope even in bad weather and wet conditions. Specifications: Component:Resin Diameter:Approx.205mm/8inch For S300 S450i S700i M500 M700 M800i M900 M1000 M1000i Easy to install: Screw the two nails onto the robot's wheels and tighten them. The included precise screws attach the nail to the wheel without any bumps. No need to remove the spikes when replacing the wheels Package Includes: 2pcs Anti Skid Spikes 14pcs Screws note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.