Diameters:
Steel Pipes Steel Tubes Square & Rectangle
25 mm 20 x 20
38 mm 30 x 10
42 mm 30 x 15
45 mm 30 x 20
50 mm 25 x 25
1/2" 30 x 30
3/4" 40 x 20
1" 50 x 25
1 1/4" 40 x 40
1 1/2" 50 x 30
56-6M 50 x 50
56-5.1M 60 x 30
57-6.80M 80 x 40
2" 60 x 60
2 1/2" 80 x 80
3" 100 x 50
Available Thickness
....mm.... 
1.0
1.2
1.5
1.8
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
3.0
3.1
3.2
3.4
3.5
3.7
4.0