This tool is a specific type of socket designed for use with fasteners featuring a square recess. The “5/16” designation refers to the size of the square opening, matching the corresponding drive size of the fastener. This specific size is commonly used in various applications, including automotive repair, machinery maintenance, and construction.
The precise fit offered by this tool type ensures efficient torque transfer and minimizes the risk of fastener damage. Historically, square drives offered improved performance compared to earlier slotted designs, reducing slippage and allowing for greater applied force. This improvement played a vital role in the development of more complex and robust machinery.