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Yes, metal corner bead. Line it up at the point, cut corners at greater than 45 degrees. Use a short six inch straght edge to make sure that the bead is proud of the drywall on both sides of the corner or you will be unable to mud it correctly. All three pieces should touch at the point of the corner, and you can make a super precise box corner this way. I get the piece in alignment, and nail it with one inch crown staples. Don't try to nail through two pieces at once, and wear eye protection.
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