Published at Saturday, 25 August 2018. Impact Driver. By Lorie Grimes.
The next thing you need to consider is the speed of the driver. The best combination is high torque and high maximum speed. Speed is measured in RPM or revolutions-per-minute. This is the amount of times your bit will spin around per minute. Look for an impact with a higher max RPM. This will help you drive those long screws through the hardest of materials at a faster rate. Any impact driver with 2200 or more RPM is considered fast.
If you need to hog out some huge holes with that spade bit, and you are not close to an outlet for your regular drill, use an impact driver to blast through without killing your battery. Since the power isn't provided just by the motor, even difficult jobs won't kill a battery as quick as a regular drill.
These powerful tools are very similar to cordless screwdrivers. They're about the same size, same weight and can be purchased for just about the same cost. The real difference is in the power.
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