XHT (Xtreme Hardness & Toughness) blades feature a unique blend of steel that ensures it's strength and are heat treated with a process that results in making them 25% - 40% harder than standard lawnmower blades. This makes XHT blades the longest lasting, safest, and most impact resistant lawnmower blades on the market.
- (3) blades required for 54" cut
- Replaces: M177791
- Fits: Z325E Z330M Z330R Z375R Z515E Z525E Z535M Z540M X380 X384 X390 X394 X570 X580 X584 X590