Why you need an oscillating tool
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Three ways an oscillating tool can come in handy around the home:

Flooring
Use this tool to scrape out carpet glue, saw through doorjambs, fit new planks, and then sand the tight corners around the new floor.

Bathrooms
Grind out old grout from between bathroom tiles and scrape up worn caulk from the edge of a tub surround.

Drywall
Use a small semicircular cutting wheel to make a clean plunge cut into drywall to install a new switch or outlet.