This 21-inch universal replacement lawn mower blade adopts a standard 3-hole design. Made of premium 40MNB manganese steel, it features high rigidity and excellent wear resistance. With professional heat treatment and black oxide anti-rust processing, the blade owns a longer service life. It can be directly installed on various mainstream lawn mowers without modification, delivering uniform and smooth cutting effect without grass pulling. Suitable for lawn trimming of home yards and small gardens. We provide customized services including laser engraving, surface coating and OEM branding. With sufficient stock and stable delivery cycle, it is a cost-effective universal accessory for foreign trade.