Rotary (3) Copperhead 12920 Blades for John Deere GX20250, GX20819, 48" Deck Rotary replacement blade fits John Deere. GX20250 GX20819 GY20569 3 Blades Required for a 48" Deck Quantity: Pack Rotary Mower Blades manufactures high-quality, OEM replacement lawn mower blades