With the Facom 804.SL feeler gauge, you accurately measure and adjust clearances in hard-to-reach areas. Thanks to the extra-long 250 mm blades, you easily reach deep or recessed gaps in engines and mechanical assemblies that standard gauges cannot access. The set features 19 precision blades spanning a range from 0.03 to 1 mm, allowing you to set valve lash, spark plug gaps, and machinery tolerances with complete precision. The rounded blade tips ensure smooth and safe insertion without damaging sensitive components. This tool gives you the confidence and accuracy needed for critical mechanical adjustments.