76.2mm x 76.2mm x 4.8mm (3' x 3' x 3/16') Aluminium Square Tube
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Lamellar plugs End caps for square pipe 30X30 mm 5 pcs. Black RAL 9005 Plastic End Caps 3x3 cm EMFA ® : Amazon.co.uk: DIY & Tools
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50MM X 50MM x 3mm MILD STEEL ERW BOX SECTION SQUARE HOLLOW 100mm to 2M LENGTHS £8.02 - PicClick UK
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Aluminium Box 3" x 1" x 3.2mm Wall
3 x 3 x 1½ Galvanised Adaptable KO Box
How many rectangles can be made out of a 3x3 box of squares? - Quora
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