REPLACEMENT PREDATOR MULCHING BLADES MADE IN THE USA!! Not cheap imports!!! Predator blades provide the flat blade design preferred by most commercial mowers with an extended cutting length for increased cutting efficiency with more resistance to bending. Tighter tolerances in the aftermarket vs. OEM. By the way they are made in the USA! 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 Hands down the ABSOLUTE best aftermarket replacement blade on the market! This sale is for 3 replacement Predator mulching blades blades. Replaces the following OEM part numbers: HUSQVARNA 510-417901 539-113312 61" CUTS Center Hole: 5 POINT STAR Width: 2-1/2" Length: 21" Thickness: .197" Predator Mulching DISCLAIMER: Please make sure you are ordering the correct blades. We list model numbers, part number and the exact dimensions so you know exactly what you are getting. The same model number normally has different deck size options. You may have an (XYZ) model but it may have a 48", 54", 60", etc. deck size. The same blade will not fit all of them, of course. You will RECEIVE the blade to match the dimensions above.