Which tool is specifically used to safeguard a hose line being hoisted over sharp edges?

The tool specifically designed to safeguard a hose line being hoisted over sharp edges is a hose roller. Hose rollers are integral in fire operations where hoses must be maneuvered around sharp or abrasive surfaces, as they help to minimize wear and potential damage to the hose. By allowing the hose to roll smoothly over edges, these rollers prevent friction and cut or tear that could weaken the hose, ensuring its reliability and functionality during firefighting efforts.

While other tools, such as clamps or guards, serve different purposes related to hose management and protection, they do not provide the same level of protection specifically designed for mitigating the risks posed by sharp edges during the hoisting process. This specialized functionality of hose rollers is crucial for maintaining the integrity of fire hoses, allowing firefighters to operate more safely and effectively.