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A "Dimpler", also known as a drywall screw setter, is a #2 Phillips screwdriver tip usually 1 inch (25 mm) long with a stopper. It is used to stop the drywall screw from penetrating the drywall.
This tool is mostly used by non-professional installers, but some professionals will use this tool for small patch jobs.
References
Dimpler Wikipedia(Text) CC BY-SA