Feeler Gauge Set Blade Length 12 in Blade Material Plastic Blade Style Straight Blade Dimension Type Inch/Metric Included Certification Certificate of Conformance Maximum Thickness - Inch 0.030 in Maximum Thickness - mm 0.762 mm Minimum Thickness - Inch 0.001 in Minimum Thickness - mm 0.025 mm Non-Marring Yes Number of Feeler Blades 13 Thickness Range 0.001 in to 0.03 in Tolerance Thickness +/-5 Percent Length +/-0.030 in Width +/-0.015 in