2-Hole Corner Angle: Metal Angles: Amazon.com: Industrial & Scientific
Sihnman 10"x10" L Shape Steel Flat Bracket (2 pc) with Powder Coating as Mending Plate, Right Angle Brackets, Corner Bracket, L Strap. Corner Angles Plate with Holes, L Plate for Truss framing.:
Everbilt 3/4 in. x 1/8 in. x 48 in. Plain Steel Angle 800887 - The Home Depot