Description: Gage block supplied with certificate of inspection that meets mechanical engineers standard for flatness, length, parallelism, and surface finish High-carbon, high-chrome steel provides high hardness and wear resistance Rectangular base for accurate wringing Length indicated with etched black characters Identification number etched in block for traceability Specification: Material: Steel Color: As Picture Shown Product Dimension(L×W×H) : 10mm/0.39 inch: 30×9×10mm/1.2×0.35×0.39 inch 15mm/0.59 inch: 35×9×15mm/1.4×0.35×0.59 inch 20mm/0.79 inch: 35×9×20mm/1.4×0.35×0.79 inch 25mm/0.98 inch: 35×9×25mm/1.4×0.35×0.98 inch 30mm/1.18 inch: 35×9×30mm/1.4×0.35×1.18 inch 40mm/1.57 inch: 35×9×40mm/1.4×0.35×1.57 inch 50mm/1.97 inch: 35×9×50mm/1.4×0.35×1.97 inch 60mm/2.36 inch: 35×9×60mm/1.4×0.35×2.36 inch 70mm/2.76 inch: 35×9×70mm/1.4×0.35×2.76 inch 80mm/3.15 inch: 35×9×80mm/1.4×0.35×3.15 inch 90mm/3.54 inch: 35×9×90mm/1.4×0.35×3.54 inch 100mm/3.94 inch: 35×9×100mm/1.4×0.35×3.94 inch Package Includes: 1 Piece of Steel Gage Block