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Includes 49 Blocks 1.01mm thru 1.49mm steps of .01mm 49 Blocks 0.5mm thru 24.5 steps of 0.5mm 4 Blocks 25mm thru 100mm steps of 25mm 1 Block 1.005mm Fitted wood case Features Grade AS2 Constructed of a special steel of high carbon & chrome content, hardened to 65RC, ensures hard wear resistance and stability. Manufactured under carefully controlled conditions to ensure maximum accuracy, parallelism and flatness. Calibrated to Fowler specifications which meet or exceed ASME B89.1.9-2002. Sets include certification traceable to the National Institute of Standards & Technology. Surface finish: .4 millionths (.01 microns).