Manual tensioners are devices used to apply tension to cables, belts, or ropes in various applications. They help maintain the correct amount of tension, ensuring that the system operates efficiently and safely. These tensioners are often found in machinery, automotive systems, and even in sports equipment. Typically operated by hand, manual tensioners allow users to adjust the tension as needed. They can be simple tools, like a lever or a crank, and are designed for easy use. Proper tensioning is crucial for preventing wear and tear on components, which can lead to malfunctions or failures in systems like automobiles or industrial machines.