Use the Powerbuilt 26-blade master feeler gauge to measure gap clearances up to 0.025" (0.635mm) with confidence. This master set includes the following blade sizes, with both metric and standard measurements: 0.0015", 0.002, 0.0025, and 0.003" - 0.025" in 0.001" increments. Meets Meets federal specification GGG-G-17c for general purpose gauges.Any automotive specialty tool makes an automotive repair or maintenance task easier, but Powerbuilt takes the concept of ‘help’ a big step further.Every package comes with professionally written usage instructions and photos that take you step by step through proper tool usage.Dependable Powerbuilt specialty tools offer power, precision and style. They meet or exceed applicable ANSI standards and have a lifetime warranty, all at affordable prices. 26 Blade Master Feeler Gauge Set