Replacement XHT Lawnmower blade. XHT(Xtreme Hardness & Toughness) blades are 25-40% harder than standard lawnmower blades. Benefits of the HXT blade are sharper and longer lasting cutting edges.More Resistance to bending. Tighter tolerances in the aftermarket vs. OEM. XHT blades also offer greater impact toughness. (2) blades for 42" cut. Side Discharge. OEM Cross Reference AM137327 M154061 12380 330-728 92-110 Compatible with models: John Deere RIDING MOWER: LT150 (42") John Deere RIDING MOWER: LT160 (42") John Deere RIDING MOWER: LT170 (42") John Deere RIDING MOWER: LT180 (42") John Deere RIDING MOWER: SST15 (42") John Deere RIDING MOWER: SST16 (42") John Deere RIDING MOWER: X300 (42" (Mulching Blade)) John Deere RIDING MOWER: X300R (42") John Deere RIDING MOWER: X304 (42") John Deere RIDING MOWER: X320 (42") John Deere RIDING MOWER: X340 (42") John Deere RIDING MOWER: Z225 (42")