Levelline Outside 90 corner beads from CertainTeed have an impact-resistant plastic core, joint tape, and formulated surface paper for improved durability. The manufacturer says compared with paper-faced metal beads, the corners are lighter, easier to handle, flexible, and forgiving, and won’t dent, crack, or rust. The joint tape guarantees bonding of the corner to drywall while using less compound and reducing dry time, according to CertainTeed. Corner beads are available in 6-foot-10-inch and 8-, 9-, and 10-foot lengths. certainteed.com

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