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.
Over the years, these drivers have been improved to the point of near perfection and this includes the batteries that power them. Battery size has grown from 9.6 volts to 18 volts and more. More than that, battery life has been greatly extended from what it was with the advent of Lithium Ion technology and subsequent improvements on that. In fact, a significant part of the cost of any impact driver, whether it comes from Makita Tools, Bosch or DeWalt is the battery or batteries that come with it.
If you have ever attempted to put a 4" polymer-coated exterior screw into pressure treated wood, over your head, with a drill, and barely got partially in before it started to strip... you understand what we are talking about.
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