Internal Angle Metal Perf 90 X 3.6m is engineered for the professional plasterer, these metal beads are the industry standard for reinforcing internal 90-degree angles in plasterboard wall and ceiling systems. Each length features precision-punched perforations that allow the jointing compound to bond directly through the bead to the plasterboard surface. This creates a superior mechanical bond that resists cracking and provides long-term structural integrity for every corner.