Feeler gage is made from 1/2-inch wide spring steel stock, close grain C1095 high carbon steel|Material is ground and polished to precision tolerances|Thicknesses are clearly etched every 6-inch in decimal and metric|Feeler gage stock is packaged in 5-inch or 12-inch flat lengths, 25 feet coils and in convenient assortments|0.001-inch to 0.023-inch coils are conveniently packaged in dispenser boxes