The Tenryu SL-30540 is a 12-Inch 40T ATAF Silencer Blade with a 1-Inch Arbor. Features: * Unique ATAF Shear Face Grind for Fast and Long Lasting Cuts * Dampened Laser Cut Plate for Less Vibration * Great for Sliding Compound Miter Saws What"s In the Box: * Tenryu SL-30540 12-Inch 40-Tooth ATAF Silencer Blade