Which tool is often used alongside a square shank screwdriver?

A square shank screwdriver is specifically designed to fit into a corresponding square hole, providing a better grip and preventing slippage during use. The tool often used in conjunction with a square shank screwdriver is a wrench. This is because when tightening or loosening fasteners, especially in plumbing or mechanical settings, it's common to use both tools to secure or adjust components. The screwdriver helps drive in screws or bolts, while the wrench can turn nuts or larger bolts that cannot be managed by a screwdriver alone.

Using a wrench with a square shank screwdriver enhances the efficiency and effectiveness of operations where both screws and nuts are involved, particularly in assembling or disassembling machinery or plumbing fixtures. This compatibility and complementary function between the two tools make them commonly paired in practical applications.