What does a drift pin help accomplish?

A drift pin is a tool designed primarily for aligning holes in metal pieces, particularly in the context of riveting or bolting. When two or more parts are to be joined, it is crucial that the holes for the rivets or bolts are perfectly aligned. A drift pin is inserted into these holes to ensure they are properly lined up before the final fastening is done. This helps to facilitate an accurate and secure connection, which is essential for the strength and integrity of the assembled components.

The other options pertain to different functions that are not related to the application of a drift pin. For instance, splicing wire ropes is a task usually accomplished with specialized fittings or tools designed for wire work, while protecting against chemical splashes requires the use of appropriate safety gear. Sending messages in low light is unrelated and typically involves other forms of communication tools or methods. Thus, in the context of mechanical assembly and alignment, the role of a drift pin is focused squarely on ensuring holes align correctly for effective fastening.