The Irwin Construction Circular Saw Blades have expansion slots to dissipate heat and prevent warping. Their construction grade tungsten carbide tips retain their edge longer and can be resharpened. The blades have alternate top bevel tooth grind for cross-cutting and ripping in all woods. The plate is fully hardened for strength and durability.The IRWIN IRW1897451 Construction Circular Saw Blade has the following specifications:Diameter: 300mm.Bore: 30mm.Reduction Ring: No.Teeth: 48.