What determines the size of a screwdriver?

The size of a screwdriver is primarily determined by the length of the blade. The length is important because it affects the reach and leverage the tool can provide when driving screws. A longer blade may be necessary for accessing screws that are situated deep within a housing or for providing more torque. Additionally, the length of the blade needs to correspond to the size of the screws being engaged, ensuring that the screwdriver is suitable for the task at hand.

While the width of the screwdriver and the width of the blade contribute to the tool's ability to fit into and engage with screw heads properly, they do not define the overall size. The weight of the blade is generally not a determining factor for sizing; different materials can alter weight without affecting the functionality related to size.