IVY Classic 36034 Premium Swift Cut 7-1/4-Inch 14 Tooth Roofer's Carbide Circular Saw Blade with 5/8-Inch Diamond Knockout Arbor, 1/Card Heavy duty professional hard body blade, Premium Swift Cut (Registered Trademark) Designed for rough cutting nail-embedded plywood, tar paper and shingles Triple chip ground C3 modified tungsten carbide teeth Reinforced shoulders stabilize carbide against impact Arbor: 5/8-inch diamond knockout, negative 6-degree hook, .098-inch kerf