OEM Part Number: M170642, UC22008. Fit for some 42" John Deere Lawn and Garden Tractors. Include 2 PCS M170642 Blades Replacement Model: Fit for John Deere 42" Riding Mower X330 X350 X354 X370 X380 / Z Trak Zero Turn 42in Mower Z335E Z335E Z335M Z345M Z345R Z320M Z320R Z315E The 42-inch mower blades Fit for John Deere 42" mower are made of materials that contain boron, carbon, manganese and other materials that ensure their strength. The durability is guaranteed to last for a long time of use and sharpness Please double check the blade type, size and applicable brand before purchase to avoid unnecessary returns Our M170642 / UC22008 lawn mower blades undergo a rigorous quality inspection before leaving the factory, if there are any problems with the product, please let us know and we will help OEM Part Number: M170642, UC22008. Fit for some 42" John Deere Lawn and Garden Tractors. Include 2 PCS M170642 Blades Replacement Model: Fit for John Deere 42" Riding Mower X330 X350 X354 X370 X380 / Z Trak Zero Turn 42in Mower Z335E Z335E Z335M Z345M Z345R Z320M Z320R Z315E