90 x 90 x 65 mm. Steel sheet, thickness 2.5. If You don't live in Great Britain. You will get answer in 30 minutes.
70 mm REINFORCED GALVANISED ANGLE L BRACKETS CORNER BRACE TIMBER 2,5mm T
Tacwise 1123 3.1 / 90 mm Extra Galvanised Framing Nails, D Head, Ring Shank, 34° Inclined, Paper Collated, Pack of 2,200, Grey
TACWISE 1723 3.1/90 mm Extra Galvanised Framing Nails, D Head, Ring Shank, 34° Inclined, Paper Collated, Pack of 1600, Silver
VHG Heavy Duty Corner Brackets - Pack of 10 Galvanised Steel L Shape Braces (70 x 70 x 55 x 2) With Beading, 90 Degree Reinforced Fixing Connectors
Tacwise 0436 Extra Galvanised Framing Nails, 3.1/90 mm, 22° Inclined, 3000
Tacwise 1811 Extra Galvanised Framing Nails, 3.1/90 mm, 34°, Pack of 800