Which type of wrench is specifically used to align holes for rail installation?

The spud wrench is specifically designed for aligning holes during the installation of elevator rails. This tool features a flat prong that can fit into and manipulate the alignment of the rail while providing the necessary leverage to make adjustments. It is an essential tool because precise alignment is critical for the safe and effective operation of elevators. The spud wrench not only helps in aligning the holes but also facilitates the tightening of the bolts once the rails are correctly positioned.

The other types of wrenches serve different purposes and are not ideal for aligning holes. For example, an adjustable wrench is more versatile for gripping various sizes of nuts and bolts but does not offer the same alignment capabilities. Box wrenches are designed for tight spaces and can grip nuts securely but lack the specific features that make a spud wrench effective for rail alignment. Socket wrenches are typically used for loosening or tightening fasteners and do not have the functionality needed for adjusting rail alignment. Thus, the spud wrench stands out for this specific task in elevator installation.