stepped block 3d model

A photorealistic, isometric engineering illustration of a machined steel stepped block. The object has two levels, featuring a realistic brushed metal texture with chamfered edges against a clean, neutral gradient background. All dimensions must be precisely labeled using dimension lines with arrows. On the object, the labels and measurements are: '8 mm' (vertical total height), '10 mm' (top platform depth), '12 mm' (top platform width), '4 mm' (vertical step height), and '12 mm' (lower platform width). An overall dimension line with red arrows is positioned below the object with the text '20 mm'. In the upper-right corner, a clear text legend is rendered which reads: 'DIMENSIONS: A = 10 mm, B = 8 mm, C = 4 mm, D = 12 mm, E = 12 mm, F = 20 mm'. The lighting should be clean and diffused to highlight the metal surface and the text clarity.