Material: Made of carbon steel with chrome-plated surface, rust-proof and wear-resistant, with clear laser engraved lines Parameters: Imperial units, gap measurement range of 0.01“-0.15”; graduated value: 0.001”, accuracy +/-0.004” asy to Operate: Quickly read the scale by placing the tilted ruler on the measured gap Function: For quick measurement of the gap width Applicable fields: Application scope: construction, railroad, electric power, ceramic sanitary ware, automobile windshield and mold gap and other gaps Taper Gap Gauge, Wedge Feeler Wedge Gauge Gage Gap Hole Measure Tool,Inch Unit 0.01"-0.15"(Graduation 0.001")