Superior Steel 18542 7-1/4" 42 Teeth 5/8" Diamond Knockout Arbor Metal Ferrous Cutting Carbide Tipped Saw Blade with Diamond Knockout Diameter: 7-1/4 inch | Number of Teeth: 42 Arbor: 5/8 inch (Diamond Knockout) | Hook Angle: 0 Tooth Design: ATB Tool Type: Portable / Worm drive Maximum RPM: 3,800