Wide Compatibility:Part Number-M170642, UC22008. These replacement mulching blades fit for John Deere 42" Riding Mowers: X330, X350, X354, X370, X380. Also compatible with John Deere Z-Trak Zero-Turn Mowers: Z335E, Z335M, Z345M, Z345R, Z315E, Z320M, Z320R. Please verify your mower model and blade size before purchase. Perfect Fit with Standard Dimensions:Center hole: 51/64", width: 2-1/2", length: 21.420", thickness: .197". Our M170642 lawn mower blades are manufactured to OEM standards, ensuring a precise and secure fit for your John Deere 42" cutting deck without modifications. Specialized Mulching Design:Our toothed mulching blades feature a grooved design that evenly chops and recycles grass clippings, returning vital nutrients to the soil for a healthier, lusher lawn. This efficient mulching capability eliminates the need for bagging and saves time during lawn maintenance. Durable & Heavy-Duty Construction:Our M170642 replacement mulching blades are made of high-quality heat-treated steel for exceptional strength, durability, and impact resistance. These heavy-duty blades maintain long-lasting sharpness, resist bending, breaking, and wearing, ensuring a clean, precise cut even under heavy-use conditions. Easy Installation & Excellent Repair Performance:Our replacement blades feature a user-friendly design for quick and simple installation. Just remove the old blades, align the center hole with the mower spindle, and secure with original hardware. No extra tools needed. These blades effectively restore your mower’s cutting efficiency, repairing dull or damaged blades to keep your lawn looking neat and well-maintained. Our M170642 42-inch mulching lawn mower blades are the professional replacement solution fit for your John Deere riding mower and zero-turn mower. Designed to meet OEM standards, these blades deliver exceptional performance, durability, and ease of use, making them the ideal choice for maintaining a healthy, well-groomed lawn. Crafted from high-quality heat-treated steel, impact resistance, and long-lasting sharpness. They resist bending, breaking, and wear, ensuring a clean, precise cut even under heavy use conditions. The specialized toothed and grooved design finely chops grass clippings, returning vital nutrients to the soil and eliminating the need for bagging, which saves time and effort while promoting a lusher, healthier lawn. These replacement blades are compatible with a wide range of John Deere models, including 42" Riding Mowers: X330, X350, X354, X370, X380, and Z-Trak Zero-Turn Mowers: Z335E, Z335M, Z345M, Z345R, Z315E, Z320M, Z320R. With standard dimensions of a 51/64" center hole, 2-1/2" width, 21.420" length, and .197" thickness, they ensure a perfect fit for your 42" cutting deck without the need for modifications. Installation is quick and straightforward. Simply remove the old blades, align the new blades with the mower spindle, and secure them with the original hardware—no special tools required. Each pack includes 2 blades, making it convenient to replace both blades at once and keep your mower operating at peak efficiency. Whether you're repairing a worn-out mower or upgrading to a more efficient mulching system, our M170642 blades are built to last and perform. Each blade undergoes rigorous quality inspection before leaving the factory, ensuring reliable performance and customer satisfaction. Please verify your mower model and blade size before purchase to ensure compatibility