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! 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********This sale is for 3 replacement USA XHT blades. Replaces the following OEM part numbers: 2 NEEDED ON 36" CUTS 3 NEEDED ON 52" CUTS EXMARK 1-303146EXMARK 1-303283EXMARK 1-303495EXMARK 1-303527EXMARK 1-633482EXMARK 1-633484EXMARK 1-633485EXMARK 103-1578EXMARK 103-1578-SEXMARK 103-2508EXMARK 103-2518EXMARK 103-2518-SEXMARK 103-2528EXMARK 103-6337-SEXMARK 103-6580EXMARK 103-6580-SEXMARK 103-6582EXMARK 103-6582-BEXMARK 103-6582-MEXMARK 103-6582-SEXMARK 103-6584EXMARK 103-6584-BEXMARK 103-6584-MEXMARK 103-6584-SEXMARK 1031578EXMARK 1031578SEXMARK 1032508EXMARK Center Hole: 5/8" Width: 2-1/2" Thickness: .197" Length: 18" Â· Disclaimer: We list model numbers and part numbers for references only. At times the same model may take different parts based on serial number breaks or manufacturers specifications. We list all the specifications on the part (size, width, length, thickness, etc.) and YOU must know what is needed on YOUR application. We canÂt possibly make it more known as to what you are receiving when you purchase.