XHT blades are made from the highest grade of steel for the best cutting and performance money can buy. With the best hardness, strength, and durability in the market, this range of blades is recommended for every mower in the market. They are stronger, harder, and last longer in any environment. 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 strength—the 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 This sale is for 2 replacement XHT blades. Replaces the following OEM part numbers: JOHN DEERE M139976 M148613 2 NEEDED ON 42" MODELS Center Hole: 51/64" Width: 2-1/2" Thickness: .197" Length: 21-3/8" John Deere (Undefined): SEVERAL (60") John Deere RIDING MOWER: GT225 (42") John Deere RIDING MOWER: GT235 (42") John Deere RIDING MOWER: GT245 (42") John Deere RIDING MOWER: GX325 (42") John Deere RIDING MOWER: GX335 (42") John Deere RIDING MOWER: GX345 (42") John Deere RIDING MOWER: GX355 (42") John Deere RIDING MOWER: LX255 (42") John Deere RIDING MOWER: LX266 (42") John Deere RIDING MOWER: LX277 (42") John Deere RIDING MOWER: LX279 (42") John Deere RIDING MOWER: LX280 (42") John Deere RIDING MOWER: LX288 (42") John Deere RIDING MOWER: LX289 (42") *DISCLAIMER- WE LIST BLADE PART NUMBERS, MODEL NUMBERS AND DIMENSIONS FOR REFERENCES BUT IT IS UP TO YOU TO BUY THE RIGHT BLADES. You will receive the blade that the dimensions are listed as.