Learn to use the tools properly (not a dig at the OP) and it will be a while before they wear out. I have a friend who uses and impact driver and helped him put a horse shed together. Watching him use the driver was painful, as he wouldn't press hard enough and then let it spin and spin in the screws until he was stripping the bits themselves. To be honest, lucky we finished the job (I took over most of tool use lol).