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 2 replacement XHT blades. Replaces the following OEM part numbers: CUB CADET/TROY BILT/MTD 942-0616A 742-0616A 942-0616 742-0616 Center hole: 6 star hole Width: 3" Thickness: .156" Length: 21-3/16" COMMERCIAL MULCHING BLADES 2 NEEDED ON 42" DECKS **DISCLAIMER- WE LIST BLADE PART NUMBERS, MODEL NUMBERS AND DIMENSIONS FOR REFERENCES BUT IT IS UP TO YOU TO BUY THE RIGHT BLADES. You will receive the blade that match the dimensions above.