Portable Saw Blades, General Construction Grade. Construction Grade Micro-Grain Teeth For Longer Life. Thin Kerf Design For Improved Speed And Ease Of Cut. Fully Hardware Plate Body For Added Durability. Expansion Slots And Heat Vents Resist Warping And Reduce Vibration For Truer Cuts. Combination Blade Accurate Rip And Cross Cuts In Hard And Soft Wood.