Which hand tool is commonly used to bore a ½" diameter hole in a panel board?

The hand tool that is commonly used to bore a ½" diameter hole in a panel board is the hand drill. A hand drill provides the necessary rotational force to create precise holes in various materials, including metal panel boards typically used in electrical installations.

While a knock-out punch is also a tool used for creating holes in metal panels, it typically is employed for slightly larger or specific hole sizes and requires additional steps, along with a wrench for adjustments. The hand drill, however, is versatile, as it can accommodate different drill bits, including those sized to create a ½" diameter hole, making it an essential tool for such tasks.

Other tools mentioned, such as a cold chisel and a hacksaw, do not effectively create the circular borehole that a drill can accomplish. The cold chisel would be more suited for cutting or carving out material rather than boring a clean round hole. Therefore, the hand drill stands out as the most effective and commonly used tool for this specific task.