traction: when the lawn is wet or the property falls with numerous heights and depths, the spikes give the robot mower better traction, no more digging in the lawn. PREMIUM MATERIAL - Our spikes are made of stainless steel. A material-related advantage is that the spikes are rust-proof and therefore durable. Easy to install and beautiful and healthy lawn: simply center the spikes on the wheels and attach with the included screws. The high-quality spikes ensure a beautiful lawn. No more holes in the lawn by driving your for Bosch Indego lawnmower robot. for Gardena Sileno city lawn mower robot for Gardena 250 Smart for Gardena 300 for Gardena 400 for Gardena Life 1000 for Gardena 500 Smart for Gardena 500 Smartand for Gardena 600 Colour:Silver Material:Stainless steel Package Contents: 1x Lawnmower Auxiliary Wheels Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.