Feeler Gauge Set, Finish Unfinished, Blade Length 5 in, Blade Material Steel, Blade Style Straight Blade, Dimension Type Inch/Metric, Included Certification Certificate of Conformance, Maximum Thickness - Inch 0.025 in, Maximum Thickness - mm 0.635 mm, Minimum Thickness - Inch 0.001 in, Minimum Thickness - mm 0.025 mm, Non-Marring No, Number of Feeler Blades 20, Thickness Range 0.001 in to 0.025 in