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A Kirschner wire (also called a K-wire) is a thin wire or pin that can be used to stabilize bone fragments. These wires can be drilled through the bone to hold the fragments in place. They can be placed percutaneously (through the skin) or can be buried beneath the skin. K-wires come in different sizes, and as they increase in size, they become less flexible. K-wires are often used to stabilize a broken bone and then removed in the office once the fracture has healed. The wires can also be threaded to help prevent movement or backing out of the wire, although that can also make them more difficult to remove. Universal Torque Ratchet - Instructions for use Changing the ratchet wheel: Draw again pin in the route of arrow on each facets with thumb and index finger and then take out or insert ratchet wheel respectively. After change let the pin snap back. Attention: The ratchet wheel can only be inserted from one side.