• Material & Finish. Usually stamped from mild steel (MS) or galvanized iron/steel with a zinc-plated finish for rust and corrosion resistance (stainless steel and aluminum variants also exist for outdoor or window-frame applications).
• Angle. Fixed 90° right-angle bend.
• Common Leg Lengths. Typically manufactured in standard sizes ranging from 19 mm (3/4") up to 50 mm (2") or 75 mm (3") per side.
• Thickness. Generally 1.5 mm to 2.5 mm (approx. 12–16 gauge) depending on whether they are light-duty cabinet braces or heavy-duty structural brackets.
• Mounting Holes. Most standard brackets feature 2 to 6 countersunk screw holes (typically 4 mm to 5 mm in diameter) so screw heads sit flush. (Note: If these are unpunched/grooved aluminum window corner keys, they are press-fit or crimped inside hollow extrusion profiles rather than screwed).