What are Cordless Screwdrivers?
Cordless screwdrivers use rechargeable batteries instead of an electrical cord to power a strong reversible motor attached to a shaft. Cordless screwdrivers feature a number of interchangeable bits, including flat blade, Philips head and socket attachments. Do-it-yourselfers and crafters often use cordless screwdrivers to prevent hand exhaustion and create more torque (twisting power)than standard screwdrivers. Torque is an important factor when using cordless screwdrivers, perhaps even more than speed. A typical screw must penetrate many layers of wood fiber or burrow through hard material in order to become an anchor. This requires substantial twisting strength, which fully charged cordless screwdrivers should have in abundance. Most cordless screwdrivers will also allow the user to tighten screws manually and only use the added torque when necessary.
