ISE Replacement Blade fits John Deere REPLACES JOHN DEERE M170639 High Lift (Standard Lift) Blade replaces John Deere M170639 Replaces JOHN DEERE: M170639, UC22008 Fits Models JOHN DEERE: x350 . Dimensions and Specifications THICKNESS0.1580' LENGTH21-3/8' C. H. DIA0.8000' WIDTH3'