A&I Mower Blade - B1SC3801
18" Blade XHT (Xtreme Hardness & Toughness) blades feature a unique steel that incorporates boron, carbon, manganese, and other materials that ensure its strength. The blades are heat treated with a process makes the blades 25% - 40% harder than standard lawnmower blades, making them the longest-lasting, safest, and most impact resistant lawnmower blades on the market. Aftermarket replacement for SCAG 481707 48108 482878 Thanks for looking!