Circular saw blades combination framing, tungsten carbide construction grade, series 20. 5/8 inch round arbor, diamond knockout. Carded diameter 6 1/2 inch Features ribbed heat vents which allow the blade to run cooler, reducing unwanted flexing and binding; an anti-stick coating reduces friction and gum-up. Thin kerf portable construction blades are designed for all-purpose cuts in natural wood, plywood and wood composites. Alternate top bevel, +25 degree hook angle,.071 inch kerf.