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Size: **54 Inch** This is a **heavy duty** cutting edge to replace the standard mild steel wear bar / cutter edge used on John Deere snow plow blades. * Its made of 1/4 x 2 AR/400 carbon steel for superior wear resistance. * The extra steel in this blade helps stabilize the plow by reducing bounce. * This is the toughest cutting blade available for the John Deere snow plow blades. **What is AR400 Steel ** AR400 is a specialty steel designed at the chemical level for **improved wear resistance** for very specific applications. The steel is relatively expensive to produce costing much more than simple mild steels such as A36 or 1018. However the steels special properties make it the only choice for applications such as blades in bulldozers. Because of the unique strengths of AR400 it is used in applications such as heavy machinery and steel plate applications. In addition to the abrasion resistance benefits AR400 has **increased impact resistance. ** This translates to digger blades and buckets on heavy machinery that can not only withstand impacts from stones and other debris but the constant movement of dirt **doesnt wear the steel down as quickly as other steels would**.