Angle bead ( corner bead )have a smooth round nose bead with

 diamond mesh wings   for the keying of plaster right up to the nose of the bead.On the outside is the   finished edge which is where one side of your drywall knife runs on when you are   applying drywall mud. The two flanges sit flat on your raw drywall. The diamond   decoration along the length of the flange act as a keyway for holding the   drywall mud to the drywall and the corner. This mesh insures a perfect bond and   provides effective reinforcement where most needed. Straight edge nose is easy   to install and permits plumb straight outside corners. Excellent protection for   corridor corners exposed to traffic. 
 
                          
                            Angle Bead: Materials
                            Galvanized Steel, Aluminium, Stainless   Steel, Zinc (99% pure zinc) Alloy 
                          
                          Angle Bead: Specifications