"The Diablo Steel Demon 7in. 38 Tooth Circular Saw Blade is a high-performance blade designed to cut thick ferrous metals mild steel only, including steel studs, angle iron, flat bar, channel, EMT conduit, all-thread rod and pipe. Features a super-thin laser cut kerf, Perma-Shield nonstick coating, laser-cut stabilizer vents, tri-metal shock-resistant brazing and more. Arbor Knockout Yes, Arbor Size in. 20mm, Blade Diameter in. 7, Blades qty. 1, Corrosion Resistant Yes, Engineered Venting Yes, Teeth qty. 38, Blade Speed RPM 5,800, Blade Use Ferrous metal, Tip Type Carbide, Tooth Grind TCG. Super-thin laser cut kerf for effortless cutting performance Tico hi-density carbide provides a controlled carbide wear that stays sharper longer Perma-Shield nonstick coating shields the blade against heat, gumming and corrosion Laser-cut stabilizer vents trap noise and vibration and stabilizes the blade Tri-metal shock-resistant brazing allows carbide tips to withstand extreme impact Laser-cut heat expansion slots allow blade to expand due to heat build-up, keeping the cut true and straight"