REPLACEMENT XHT BLADES Extreme Hardness Toughness 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. By the way they are made in the USA! Predator blades offer superior mulching capabilities over traditional mulching blades. The airflow tooth design increases blade strength while producing more airflow for smaller clippings. Predator blades have all the same benefits as XHT (Xtreme Hardness & Toughness) blades. Hands down the ABSOLUTE best aftermarket replacement blade on the market! This sale is for 3 replacement XHT blades. Replaces the following OEM part numbers: This is the Predator commercial mulcher blades! GX20250JOHN DEERE GX20434JOHN DEERE GX20819JOHN DEERE GY20568JOHN DEERE 3 BLADES NEEDED ON 48" CUT MACHINES Center Hole: 11/16" Width: 2-1/2" Thickness: .197" Length: 17" Outer hole size: 13/32" Center to center on outer hole: 3-3/4" Fits the following models with 48" decks L120 L130 155C L2048 DISCLAIMER: We list part numbers and model numbers for references but sometimes there may be serial number breaks and different deck sizes for the same model. We list the EXACT blade dimensions so you know EXACTLY what you will be receiving. Know what you need before buying.