Oldham 438C418 4-3/8-Inch 18T Carbide Saw Blade Max Life Fast Blade specifically designed for use with cordless saws, to provide more cuts per battery charge Designed with minimal kerf thickness to cut fast, with less drag Razor smooth tips, made of tungsten micrograin carbide, provide high impact resistance and cut fast and clean Optimal plate thickness to achieve fast cutting while retaining plate stiffness for accurate cutting Fully flattened plate for easier cutting, less resistance