XHT BLADES Extreme Hardness ToughnessIncreased 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 Predator blades offer superior mulching capabilities over traditional mulching blades. The airflow tooth design increases blade strength while producing more airflow for smaller clippings. Predator blades have all the same benefits as XHT (Xtreme Hardness & Toughness) blades.****This sale is for 2 replacement XHT Predator blades. Replaces the following OEM part numbers: MURRAY 056251E701MURRAY 092002E701MURRAY 456251MURRAY 495103-3MURRAY 4951033MURRAY 56251E701MURRAY 9187-853MURRAY 91871-853MURRAY 91871E701MURRAY 91871HTMURRAY 91871853MURRAY 9187853MURRAY 2 Needed for 40" cut machines Center Hole: 27/32" Width: 2-1/2" Thickness: .250" Length: 20-3/8" 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.