REPLACEMENT XHT BLADES Extreme Hardness Toughness MADE IN THE USA! Don't be fooled by other cheap imported blades you see on eBay! Buy from home! The XHT blades are made with MARBAIN which is what makes them THE BEST BLADE ON THE MARKET! Increased hardness (between 48-52 on the Rockwell Hardness Scale), without brittleness Greater yield strengthÂthe strongest mower blades on the market Better impact toughness (ANSI-S483 compliant) Increased resistance to bending Higher wear resistance Reduced weight Faster start/stop Less wear on PTO clutch break Lower fuel consumption Last longer and need to be sharpened less frequently Our patented MARBAIN material is a durable, cost-effective alternative to abrasion resistant steel and other manufacturing materials Hands down the ABSOLUTE best aftermarket replacement blade on the market! This sale is for 3 replacement XHT blades. Replaces the following OEM part numbers: JOHN DEERE GX21380 GY20679 GY20684 GY20686 Blade specs Center hole: 7 LOBE Width: 2-3/4" Thickness: .187" Length: 18-5/8" John Deere (Undefined): SEVERAL (54") John Deere RIDING MOWER: D170 (54") John Deere RIDING MOWER: G100 (54") John Deere RIDING MOWER: G110 (54") John Deere RIDING MOWER: LA150 (54") John Deere RIDING MOWER: LA175 (54") John Deere RIDING MOWER: 190C (54") **DISCLAIMER- WE LIST BLADE PART NUMBERS, MODEL NUMBERS AND DIMENSIONS FOR REFERENCES BUT IT IS UP TO YOU TO BUY THE RIGHT BLADES. If you order them and they don't fit it is not our fault! Not trying to be ugly or rude but just fair to both parties. KNOW WHAT YOU NEED BEFORE YOU BUY! We always accept returns but the shipping to and from will be your responsibility unless we make the error.