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 M131958 Blade specs Center hole: 29/32" Width: 2-1/2" Thickness: .250" Length: 21" Mulching ALL OF THE FOLLOWING WITH 60" DECKS COMPACT TRACTOR 2520 3120 3320 3520 3720 4200 4210 4300 4310 4400 4410 RIDING MOWERS F620 F687 F735 M665 X700 X710 X720 X724 X728 X729 X730 X734 X738 X739 X740 X744 X748 X750 X754 X758 Z520A Z720A Z830A Z840A Z850A Z910A Z915B Z920A Z920M Z920R Z925A Z930A Z930M Z930R Z950A Z950M Z950R Z960A Z960R Z970A Z970R Z997R 1420 1435 1445 1545 1550 1565 1570 1575 1580 1585 737 757 777 797 997 **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 match the dimensions above.