Rectangular Gauge Block Set, Long Form Calibration Certificate Yes, Material Steel, Dimension Type Inch, Grade Economy, Included Size Range 0.05 in to 4 in, Included Sizes (9) 0.1001 to 0.1009 in, (49) 0.101 to 0.149 in, (19) 0.050 to 0.950 in, (4) 1.000 to 4.000 in, Increments 0.0001 in (0.1001 in to 0.1009 in), 0.001 in (0.101 in to 0.149 in), 0.05 in (0.05 in to 0.95 in), 1 in (1 in to 4 in), Number of Pieces 81, Shape Rectangular, Tolerance +/-0.00005 in, With Hole No, Case Type Wooden Case