Features:Each leaf of the thickness gage is made of fine tempered steel, hardenedTapered thickness gage — Metric 20 leaf set0.05mm , 0.10mm , 0.15mm , 0.20mm , 0.25mm , 0.30mm , 0.35mm , 0.40mm , 0.45mm , 0.50mm , 0.55mm , 0.60mm , 0.65mm , 0.70mm , 0.75mm , 0.80mm , 0.85mm , 0.90mm , 0.95mm and 1mm 100mm in lengthThe exact thickness is marked on each leaf. Steel case with lock nut.Meets U.S. Federal Specifications.