REPLACEMENT XHT BLADES Extreme Hardness Toughness MADE IN THE USA! Don't be fooled by other cheap imported blades you see online! Quality does matter so buy right the first time! 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 XHT blades. REPLACES ARIENS/GRAVELY 08779251 08779200 046998 C046998 Center Hole: 5/8" Width: 2.5" Thickness: .197" Length: 17" 50" Decks 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.