What type of tool should not be struck with a hammer?

The appropriate tool that should not be struck with a hammer is the file. Files are designed for shaping and smoothing materials through abrasion rather than impact. Striking a file with a hammer can lead to damage, including deformation or cracking of the file's surface, ultimately affecting its ability to perform effectively.

Unlike files, chisels and wrenches are designed to withstand impact; chisels are often struck with a hammer to drive them into materials, while wrenches are built to handle the torque and force necessary for loosening or tightening bolts. Screwdrivers, though typically used for turning screws, can sometimes be struck lightly if necessary, though it's not a common or recommended practice. Therefore, files are uniquely sensitive to such forceful impact and should be handled with care to maintain their integrity and functionality.