This specific tool is a type of screw-driving bit characterized by its square-shaped tip, designated number two in a standardized sizing system. This size is commonly used for driving screws with a corresponding square recess. It offers a more secure grip and higher torque transfer compared to slotted or Phillips drive systems, reducing cam-out. A visual example can be readily found with a quick online image search.
The secure engagement provided by this design is crucial for applications requiring significant force, making it popular in construction, automotive repair, and furniture assembly. Its development addressed the limitations of earlier drive types prone to slippage, thereby improving efficiency and reducing workpiece damage. The standardized sizing ensures compatibility across various tool brands and screw manufacturers.