A decent impact driver should have a switch to turn the impact function on or off.
No impact driver that I'm aware of does this. Are you not thinking about the hammer/percussion setting on a drill driver?
Yes a collar that rotates to lock out the impact. Mine are too old but some newer ones have a hammer icon and a screw icon.
@stevo_com started
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A decent impact driver should have a switch to turn the impact function on or off.