Cornerbeads And Trims Are Traditional Reinforcement And Finishing Products Used In Gypsum Wallboard Construction. Corner Bead And Trims Provide Crisp, Clean And Straight Protection For Drywall Corners. Corner Bead And Trims Are Nailed, Screwed, Stapled Or Clinched In Place And Finished With Joint Compound. They Are Low Cost Easily Applied And Provide High-Quality, Long Lasting Professional Finishes.