The Irwin General Purpose Table & Mitre Saw Blade with construction grade tungsten carbide tips that retain their edge for longer and are resharpenable Expansion slots help to dissipate heat and prevent warping The blades have a fully hardened plate that runs truer for longer and with more accuracy They have an alternate top bevel ATB tooth grind for cross-cutting and ripping in all woods Coated with a corrosion-resistant coating for increased high quality performance