What does a chuck do in relation to a drill?

A chuck is a crucial component of a drill, as it serves the primary function of securing the drill bit or attachment. This mechanism enables the drill bit to be held firmly in place during operation, ensuring that it operates effectively and safely. A well-secured chuck prevents the drill bit from slipping or disengaging while in use, which is essential for precision and maintaining the integrity of both the drill and the workpiece.

In contrast, the other options represent different functions that are not associated with a chuck. The power supply is typically managed by the battery or electrical cord of the drill, safety guards serve to protect the user from debris and accidental contact with moving parts, and speed control is usually handled by a variable speed switch or dial on the drill itself. Understanding the role of the chuck is fundamental for safe and effective use of power tools, as it directly affects the performance and accuracy of drilling tasks.