Trying to turn screws with a coin or your fingernail is pretty inefficient at best and painful at worst. A screwdriver gets the job done quickly and with minimal exertion.
Browse for the screwdriver type you need to handle day-to-day tasks or a special project, whether you need a Phillips, flathead, or Torx. For extra efficiency, consider a ratcheting screwdriver. Whether loosening or tightening or a little of both, get the job done quickly and safely.