A specific size of hand tool used for turning fasteners, typically nuts or bolts, is described by these dimensions. The first two numbers, “15/16,” specify the size of the opening designed to fit a fastener head of corresponding dimensions. “3/8” refers to the size of the square drive on the other end of the tool, which engages with a ratchet, extension, or other drive tool. This combination allows for the application of significant torque to fasteners.
The availability of a wide range of socket sizes is essential for working with various fasteners encountered in mechanical, automotive, and other applications. Properly sized tools ensure a secure grip on the fastener head, preventing slippage and potential damage. The use of drive tools allows for greater leverage and efficient fastening, especially in confined spaces or situations requiring high torque. The standardization of these sizes ensures compatibility across different tool manufacturers.