Metal Cutting Circular Saw Blades For Cutting Thin Steel 68 Tooth Carbide Tipped Blade - 7 in (20 mm arbor),..-Note: Designed for use with Evolution saws or other low RPM saws. 0.063 in kerf, 3900 RPM 3900 RPM 68 Carbide Teeth, .063-Inch Kerf 20mm Arbor Size