[STANDARD SPECIFICATION DESIGN] Lawn mower blade size: 1.37x0.7x0.02 inch, with a central aperture of 0.28 inch, included 18 * , 18 *screws. The precision of the process results in minimal errors, making it a perfect replacement for old and ensuring efficient operation of the lawn mower. [ MATERIAL] Robot lawn mower made of stainless steel with titanium coating, the blade is a double-sided blade, excellent resistance, less prone to rolling and wear, the screws are easy to install and change, and has a longer overall service life. Good cutting performance, the perfect cut keeps your lawn clean, green and healthy. [COMPATIBLE MODELS] The knives are for : S300 WR130E, M500 WR141E, M500 Plus WR165E, M700 Plus WR167E, L800 WR148E, L2000 WR155E. Freelexo 400 BT, 550, 500 BT, 1200 LCD BT etc. multiple lawn mower models, check if the models match before purchasing. [EFFICIENT CUTTING] The robot lawn mower bring you more efficient cutting performance. can cut more lawn area, which means they reduce the frequency of blade replacement and improve machine efficiency. They are an efficient assistant to of your yard, trim grass and trees, and enjoy . Blade:, continuous bending Color:Gold Material:Stainless steel Package Contents: 18 x replacement 18 x screws 18 x washers 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.