Promax PM-0778016-10 Steel Blade, 7-1/4-inch by 16-SLOT tooth, steel cutting, 10-Blade bulk pack Great for cutting corrugated steel, light sheet metal, and steel siding Fits: most portable power saws with a 5/8 inch arbor hole and a diamond knock-out 10-PACK 16-slot design for friction cutting. Max RPM: 8,500 rpm