Affinity Tool Works cuts through concrete, granite, stone, and even steel with its 12- and 14-inch Dtec Superior Diamond Blades for gas-powered cut-off saws. The 15-millimeter-high rim teeth dig into more surface area for faster cuts that keep the blade sharp longer, says the manufacturer. Cooling holes dispel heat, and a reinforced flange strengthens the thin blade, reducing vibrations and warping. 866.588.0395.