Our stainless steel stainless steel is made of our stainless steel. All edges of the traction improvement are deburred. The quality steel screws with Torxkopf (4x20) ensure easy assembly of the Spikes robotic lawnmower. Due to the lowered screw holes, the screws fit perfectly into the spikes and ensure a perfect look of your lawnmower robot. Child -light assembly - simply center the robotic lawnmowers spikes on the wheels and attach them with the screws supplied! ✅ Compatible with Allen S and M models - S300 [WR130E]; M500 [WR141E]; M700 [WR142E]; M1000 [WR143E]; S450i [WR101 Si]; S450i [WR102SI]; S500i [WR105SI]; S450i [WR106SI]; S700i [WR101 Si]; M800i [WR111MI]; M800i [WG757E]; M900 [WG758E]; M1000i [WG796E.1]; M1200i ID B [WR113MI]; M500 2.0 [WR165E]; M700 2.0 [WR167E] / also with Alle.