Avenger AV-49940 Steel Cutting Saw Blade, 4-inch by 20 tooth,20mm arbor with 10mm adapter bushing, C-6, TCG High carbon steel alloy body that is heat treated, surfaced ground to prevent flexing, bending and distortion, hand tensioned to guarantee flatness Fits most portable power saws with a 20 mm arbor C-6 professional grade carbide Tooth Grind: TCG Max RPM: 4,200 rpm