For measuring clearances to 0.025". Blades include: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, 0.025. Metric and standard measurements on blades. Meets Fed Spec. GGG-G-17c.