The edger blade is made of alloy steel structure and serrated edges, which is serviceable and has excellent performance. This blade has wear indicator holes that can help you determine when to reverse or replace the blade. The blade is designed with double sided double teeth. Get the most out of your dual serrated edging blade by reversing it when dull to make use of fresh cutting edges and extending the life of the blade. Does not fit every model mentioned above, please order by model, type and serial numbers of your machine. Fit for RY13050 4 cycle wheeled edger; fit for RY13050A 4 cycle wheeled edger; compatible with RY15518 edger attachment; fit for RY40030 edger attachment. This product can be replaced with 638006008 and 638006007. Color:Black Material:Metal Package Contents: 2 x Electric Edger Trimmer 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.