DEWALT DWA7538 5-3/8" 30T Ferrous Metal Cutting 20mm arbor features better carbide for longer life and less chipping of teeth - important information when they need to replace blade. The blade is laser etched and color coded by material so that user can see important information when they need to replace blade. This blade strengthens plate and eliminates run out while extending life. Commonly used for steel cutting applications. Specifications: Diameter: 5-3/8", Teeth: 30, Arbor 20mm.