These ratcheting multi-bit screwdrivers have a mechanism that allows the tool to rotate a screw in one direction without repositioning the tool on the screwhead. They can turn screws more quickly than a standard driver and are reversing so they can tighten and loosen screws. Screwdrivers come with multiple tip sizes and styles that attach to one handle and allow a single tool to loosen and tighten a variety of screws.