Section Size : A x A x Leg Thickness 16mm x 16mm x 3mm 20mm x 20mm x 3mm 25mm x 25mm x 3mm 3mm leg thickness Stock tolerance of +/- 0.2mm on Width and ThicknessAvailable Lengths100mm, 150mm, 200mm, 300mm, 400mm, 500mm, 600mm & 1000mm (1M) Length are cut to a precision of +/- 2mm (0.078 inches) Cutting services are available for this product, so please enquire for alternative product lengths. Machining services are available please contact us. Surface finish As drawn. EN3B – Mild Steel EN3B is a grade of mild steel which is considered as general-purpose low carbon steel that also lends itself particularly well to welding processes. Another advantage of this type is that it can be case hardened for increased wear resistance properties. EN3B can be supplied in Square, Flat (Rectangular) and equal angle section types.