Calibre de folga 26 lâminas, para comprovar e ajustar o espaço entre duas peças, como tolerância de válvulas, folga nas velas de ignição e contatos do distribuidor, lâminas de aço endurecido e temperado, gravadas com medidas em polegadas e milímetros, espessuras: .0015” (.04mm), .002” (.05mm), .0025” (.06mm), .003” (.08mm), .004” (.10mm), .005” (.13mm), .006” (.15mm), .007” (.18mm), .008” (.20mm), .009” (.23mm), .010” (.25mm), .011” (.28mm), .012” (.28mm), .013” (.33mm), .014” (.35mm), .015” (.38mm), .016” (.40mm), .017” (.43mm), .018” (.45mm), .019” (.48mm), .020” (.50mm), .021” (.53mm), .022” (.55mm), .023” (.58mm), .024” (.58mm) e .025” (.63mm).