Impact drivers are power tools used to fasten nuts rapidly to bolts.
They come in different shapes and sizes and some of them are more
powerful than others. Automobile mechanics used them on a daily basis,
to loosen and tighten nuts and bolts. Stair builders use them to attach
angle tread brackets and treads to stair stringers.
Make sure that you read the manufacturer's operation
instructions and understand how to operate impact drivers safely. Some
of these power tools are powerful and I've seen them put a lot of
pressure on a carpenter's wrists.
If you're planning on mass-producing stairs that require nuts, bolts or
lag screws, a impact driver wouldn't be a bad investment. Most framing
contractors and carpenters usually have at least one of these tools,
with them at all time.
When I was building a lot of homes, this was another tool that I didn't
want to leave home without.
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