The Irwin Construction Circular Saw Blade with expansion slots which dissipate heat and prevent warping. Its construction grade tungsten carbide tips retain their edge, and the plate is fully hardened for durability. The blade features alternate top bevel tooth grind (ATB) for cross cutting and ripping in all woods. Its corrosion resistant coating provides longer quality performance. Suitable for use with handheld corded machines. This IRWIN Construction Circular Saw Blade has the following specification: Blade Diameter: 210mm.Bore: 30mm.Teeth: 40.Kerf Thickness: 2.5mm.Tooth Config: ATB.