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