What is the function of a chuck key?

A chuck key is a specialized tool used to secure and release the drill bit from the chuck, which is the part of the drill that holds the bit in place. When changing drill bits, the chuck key is inserted into the chuck to tighten or loosen it, allowing the user to easily swap out one drill bit for another. This process is essential because using the right drill bit for specific tasks is crucial for achieving accurate results and maintaining the equipment.

The other options do not accurately describe the primary function of a chuck key. Operating a drill press typically involves various controls and not just the chuck key; adjusting drill speed is managed through separate mechanisms on the drill itself; and cleaning the drill bit is a maintenance task that does not involve a chuck key directly. Thus, the main and correct role of a chuck key is to facilitate the changing of drill bits.