When loose sheets of paper need to stay together for a short time, a paper clip is the go-to tool. You slide it over the edges of the stack, and the papers hold firm until needed again.
The clip's form—a thin wire bent into an outer long loop connected to a shorter inner loop, with ends turned slightly inward—makes this possible. This shape positions the inner loop parallel to the outer one, close but not touching.
The two loops create built-in tension. When papers are inserted between them, the inner loop presses outward against the outer loop, clamping the sheets tightly in place. This holds even thicker stacks without slipping.
The open end of the loops allows papers to slide in smoothly from one side. The curves guide the edges straight into the gripping area, ensuring even pressure across the stack.
The inward bends at the wire ends keep the clip stable on the papers. They also allow the clip to flex open wider for thicker bundles and snap back to grip firmly.
This looped arrangement supports quick attachment and removal. It works reliably across different paper counts, directing how documents are bundled and unbundled.
The paper clip appears ordinary, but its wire bends are shaped to control paper handling precisely.