Provides Traction: When the lawn is wet or the ground has many inclines and slopes,the nails give the robotic lawnmower better traction,eliminating the need to dig in the lawn Built to Last: Made of high-quality plastic material,wear-resistant and durable,and the right size to provide you with long-term service Easy To Install: Just center the spike on the wheel and secure it with the included screws Beautiful Lawn: High-quality spikes ensure a beautiful lawn. No more holes in your lawn with your lawn mower robot Compatible with: Bosch Indego M+ 700 Bosch Indego M 700 Bosch Indego S+ 500 Bosch Indego S 500 Bosch Indego XS 300 Package included: 2 x Spikes 12 x Self-tapping Screws 1 x English User Manual Other things not included