Simpson Strong-Tie 2-in x 3-in 12-Gauge Galvanized Steel Angle in the Angles, Brackets & Braces department at Lowes.com
Amazon.com: VinBee 60 Pcs L Shape Brackets Flat Corner Brace Plates Metal Repair Plates Stainless Steel Plates for Wood Fixing Connector Straight Repair Fixing Brackets Heavy Duty - 2 Inch x 2
Corner Brace Angle Bracket Stainless Steel L Shape 72mmx72mmx48mm 4Pcs - 2.83 x 2.83 x 1.89"(L*W*H); - Bed Bath & Beyond - 34070892
Amazon.com: 10 PCS 2¾ Inches Black Steel L Right Angle Bracket, Heavy Duty Corner Brace Thickness 3mm, Max.Load 110LB, Strengthen Design Metal Joint Support : Industrial & Scientific