[Replacement]: Replace for 72531-VH7-000 (upper) and 72511-VH7-000 (lower) lawn mower blade set. [Compatibility]: HRX217, HRX217K1, HRX217K2, HRX217K3, HRX217K4 models. [Specification]: The 21-inch replacement lawn mower blade set is made of high-quality metal material with a black coating for added durability. [Please Note]:Our blades are Part Number-compliant and easy to install. Before purchasing, verify that the OEM number of the blade you are replacing matches the Part Number number provided with this product. The actual product may have slight color differences or differences, which does not affect use. Colour:Black Material:Metal Package Contents: 2 x Lawn Mower Blade Set 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.