What is this close-up picture? (WotsThat: Razor blade edge (macro))

Question

What object is shown in this zoomed-in close-up photo?

OxideRift · Accepted Answer

Razor blade edge (macro). Razor blades are honed to a thickness of just 0.1 millimeters at their edge, making them sharper than a surgeon's scalpel. This extreme thinness is why they can cut through hair and skin so effortlessly, but also why they dull relatively quickly with use.

Answer: Razor blade edge (macro)

More industrial close-ups