SPI Steel Rectangular Gage Block Set 36 piece set - Grade 0 Meet or exceeds Federal Specifications B89.1.9-2002 Certificate of Calibration included Included in this set... 9 Blocks 0.1001" thru 0.1009" 0.0001" steps 9 Blocks 0.101" thru 0.109" 0.001" steps 9 Blocks 0.110" thru 0.190" 0.010" steps 4 Blocks 0.200", 0.300", 0.400", 0.500" 2 Blocks 0.050", 0.100" 3 Blocks 1.000", 2.000", 4.000"