The MasterPlate is a solid 6-by-10-by-1/4-Inch thick aluminum "tool makers" quality plate, ground flat to within thousandths of an Inch * The MasterPlate provides a full flat 10-Inch surface parallel to the miter slot and a vertical height of almost 7-Inch perpendicular to the table top * Fits both 5/8 and 1-Inch diameter arbor shafts * Set both miter and bevel angles on saws to within minutes of a Degree * Use the MasterPlate to calibrate and troubleshoot table saws, radial arm saws, chop saws and sliding compound miter saws