Specifications Product name: Robot lawn mower spikes Material: 304 stainless steel Color: Gray Size: 205 mm 2.5 mm Package size: 24 26 1 cm Package content: stake 2, screw 2, assembly instructions 1 Features: Made of 304 stainless steel, polished, high quality, abrasion resistant, durable. With improved traction, effectively prevent your robot lawn mower from digging and leaving leaves in the lawn. Easy to assemble Comes with 12 screws, you just need an extra screwdriver to tighten the spikes on the wheels with them. High compatibility Replacement for allthe S and M models of the W-o-r-x L-a-n-d-r-o-i-d robot lawn mowers: M500 2.0 [WR165E], M700 2.0 [WR167E] S450i [WR101 SI], S450i [WR102SI], S450i [WR106 SI], S700i [WR101SI] M800i [WR111MI], M800i [WG757E], M900 [WG758E], M1000i [WG796E.1] S300 [WR130E], M500 [WR141E], M700 [WR142E], M1000 [WR143E], etc. ATTENTION: NOT POSSIBLE with Plus - 2021 models. Driving on sensitive ground may cause damage.Use at your own risk, no liability accepted.