INSIZE Steel Rectangular Gage Block Set 36 piece set - Grade AS-1 Meets or exceeds Federal Specifications B89.1.9 Short Form Cert traceable to NIST included Included in this set... 1 Block: 0.05" 9 Blocks 0.1001" thru 0.1009" in 0.0001" steps 9 Blocks 0.101" thru 0.109" in 0.001" steps 9 Blocks 0.11" thru 0.19" in 0.01" steps 5 Blocks 0.1" thru 0.5" in 0.1" steps 1 Block: 1" 1 Block: 2" 1 Block: 4"