What is a bucking bar used for?

A bucking bar is a heavy, solid tool used in metalworking, particularly in aircraft manufacturing and repair. It provides a stable surface against which rivets or fasteners can be bucked, or deformed, during the riveting process. This ensures a tight, secure fit and helps to maintain the integrity of the structure being worked on. The shape and weight of the bucking bar allow for effective application of force without damaging the surrounding material.