32 Blades Steel Feeler Gauge Dual Marked Metric and Imperial Gap Measuring Tool Durable for use: The Feeler Gauge Set Constructed from hardened tempered steel with a lube oil coating to prevent pitting and corrosion. Wide application： Suitable for designers, engineers, mechanics to measure the thickness of tappet clearances, spark plugs gaps, bearing clearances, piston ring gaps and other hard to reach places. Metric Sizes Feeler Gauge (mm): 0.04, 0.05, 0.06, 0.08, 0.10, 0.13, 0.15, 0.18, 0.20, 0.23, 0.25, 0.25, 0.28, 0.30, 0.33, 0.35, 0.38, 0.40, 0.43, 0.45, 0.48, 0.50, 0.53, 0.55, 0.58, 0.60, 0.63, 0.65, 0.70, 0.75, 0.80, 0.88. Inch Sizes Feeler Gauge : 0.0015, 0.002, 0.0025, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.010, 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, 0.026, 0.028, 0.030, 0.032, 0.035 Specifications: Measuring range: 0.0015 inch/ 0.04 mm to 0.035 inch/ 0.88 mm Material: 65 manganese steel Blades: 32 pieces Package Includes: 1 x Feeler Gauge