DEWALT DW3174 Construction Series 7-1/4-Inch 20 Tooth ATB Thin Kerf Pressure Treated and Wet Lumber Cutting Saw Blade with 5/8-Inch and Diamond Knockout Arbor Tougher tungsten carbide stays sharper longer Specially formulated anti-stick coating minimizes friction and gum-up for smoother cuts Thin kerf for fast and smooth cutting action Ribbed heat vents allow blade to run cooler, reducing blade flexing and binding All blades feature 5/8-inch arbor with diamond knock-out;