Metabo KSAP18 18-Volt Cordless 6-1/2-Inch Circular Saw 18-volt cordless 6-1/2-inch circular saw provides no-load speed of 2,500 RPM Air-cooled charging system decreases charging time by 30 percent; 18-volt 2-ah battery pack charges up to 2000 times Built with sturdy aluminum die cast housing Built-in collector fan prevents overheating; safety lock switch to prevent unintentional start-up 3-year limited warranty; 6-1/2 inch circular saw blades