1 Name Square tube, other name: Square tubing, Square hollow section, SHS, RHS,Square hollow profile. 2 Definition A tube is a closed shape used to perform some structural function. The shape can be round, square, rectangular or whatever can be designed and manufactured for a particular application. 3 Size Thickness: 1mm to 35mm 20x20mm to 800x800mm 20x30mm to 600x800mm Length: 5.8m,6m, 12m 4 Standard A500 GR.A, B,C (materials Q235B, Q345B) EN10219 S235 JRH S275 JRHS355 JRH EN10219 S235 J0H S275 J0HS355 J0H GB T6728 5 Usage Furniture; Steel structure; Crash barrier