Two engine crankshafts, one dark brown and one metallic gray, on…

Two crankshafts are shown on a dark, speckled surface. The crankshaft in the foreground is dark brown with brass-colored bearings, while the crankshaft in the background is metallic gray and appears to be new. A portion of a white box with black text is visible in the background.

AI caption July 2017 · Photo 31 of 138