Fowler Inch 26 Leaf Set Tapered Thickness Gage Features include... Each leaf of the thickness gage is made of fine tempered steel, hardened Tapered thickness gage 26 leaf set 0.0015", 0.002", 0.0025", 0.003", 0.004", 0.005", 0.006", 0.007", 0.008", 0.009", 0.010", 0.011", 0.012", 0.013", 0.014", 0.015", 0.016", 0.017", 0.018", 0.019", 0.020", 0.021", 0.022", 0.023", 0.024", and 0.025" 3" in length The exact thickness is marked on each leaf.åÊ Steel case with lock nut. Meets U.S. Federal Specifications