Feeler Gauge Set Finish Unfinished Blade Length 77 mm Blade Material Steel Blade Style Short Blade Dimension Type Metric Included Certification None Maximum Thickness - mm 1 mm Minimum Thickness - mm 0.05 mm Non-Marring No Number of Feeler Blades 20 Thickness Range 0.05 mm to 1 mm Tolerance +/-0.004 mm