CTA Tools A311 25-Blade Extra Long Feeler Gauge is designed for long reachapplications, especially diesel. There are 25 removable blades, each 12-inchlong, that have metric markings. Blade sizes are 0.0015, 0.002, 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, 0.025, 0.027, 0.030 and0.040-inches. Whether tuning up your 68 Corvette or changing the oil on aJohn Deere tractor, CTA can supply you with the tools needed to do the job.California Prop 65 – Warning, This product contains chemicals known to theState of California to cause cancer, birth defects or other reproductive harm.