JOHN DEERE STANDARD LIFT MOWER BLADE KIT (GY20850)JOHN DEERE STANDARD LIFT MOWER BLADE KIT (GY20850) SUITS 42 DECK (D, LA, X & 100 SERIES) Standard Blade Kit (StarLock Center Hole). Contains (2) blades for a 42 inch Deck. To encourage a greener, fuller healthier lawn, be sure to mow with sharp lawn mower blades. Use Genuine John Deere Lawn Mower blades to get the perfect fit on the spindle. Our lawn mower blades are manufactured with a combination of carbon and boron to provide hardness for a long