Big M.A.C blade for cutting Masonry, asphalt, concrete with a gas powered hand held cut-off saw or quickie saw. Special silicon carbide grain. Superior cutting action. 40% longer life than general purpose concrete wheels. Masonry, Asphalt, Concrete. External fiberglass reinforcement withstands offhand lateral pressure for added safety and controlled performance. Special silicon carbide grain formula provides excellent cutting action on masonry, concrete, stone and aggregate. More fiberglass reinforcement than competitors for increased torque strength