32 Pc. Feeler Gauge Set Made in the USA - Quality and Availability Feeler Gauges Are Mostly Used to Measure Gap Widths - the Clearance Between Two Parts For Easy Identification, Each Blade is Permanently Marked with the Blade Thickness. Measures Clearances From 0.0015" to 0.035" Set Includes One Brass Blade to Use with Electronic Ignitions Blades Are Flexible Enough That, Even If They Are All on the Same Hinge, Several Can Be Stacked Together to Gauge Intermediate Values