Emperial Feeler Gauge 
26 Blades, thickness: 0.024, 0.015, 0.023, 0.02, 0.022, 0.025, 0.021, 0.003, 0.20, 0.004, 0.19, 0.005, 0.18, 0.006, 0.17, 0.007, 0.016, 0.008, 0.015, 0.009, 0.014, 0.010, 0.013, 0.011, 0.012, 0.025 inch .