Description Made of SPCC, Cold plate+surface electroplating material, sturdy and durable CNC finishing, surface oxidation treatment, no burr, and no scratch Easy to install, just center the stainless steel spike on the wheel and secure it with the included screws 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 Specification: Material: SPCC, Cold plate+surface electroplating Size: 205mmx2.5mm Compatible with: Worx Landroid M500 2.0 [WR165E] Worx Landroid M700 2.0 [WR167E] Worx Landroid S450i [WR101 SI] Worx Landroid S450i [WR102S1] Worx Landroid S450i [WR106SI] Worx Landroid S700i [WR101 SI] Worx Landroid M800i [WR111MI] Worx Landroid M800i [WG757E] Worx Landroid M900 [WG758E] Worx Landroid M1000i [WG796E.1] Worx Landroid S300 [WR130E] Worx Landroid M500 [WR141E] Worx Landroid M700 [WR142E] Worx Landroid M1000 [WR143E] Package included: 2 x Lawn Mower Wheel Spikes 12 x Screws Other items not included