One of the great things about the cordless-tool revolution is the number of tools now available on lithium-ion battery platforms from various manufacturers. Yet, the sheer diversity of cordless tools can make selecting the right one utterly confusing. Nowhere is this more evident than in the purchase of an impact driver. This tool functions with a micro-hammering action as it rotates the bit and is ideal for driving virtually any threaded fastener (Philips, slotted, square-drive, Torx, etc.) and even impact-rated drill bits. If you are ready to pull the trigger on a tool that will provide years of hard-working service, here are a few ways to break down your purchase.