This is a structural material with cross section of 90 degree angle. The dimension is determined by the length and the thickness of the two sides. If the lenghts of the two sides are equal, it is equal angle, otherwise it is unequal. It is used in all construction activity. The most common length available is between 10m to 12m.

Rationalised sizes of Angles and Section Weight   3 4 5 6 8 10 12 16 18 20Size 25 20*20 0.9 1.1 25*25 1.1 1.4 1.8 2.2 30*30 1.4 1.8 2.2 2.8 35*35 1.6 2.1 2.6 3.0 40*40 1.8 2.4 3.0 3.4 45*45 2.1 2.7 3.4 4.0 50*50 2.3 3.0 3.8 4.5 55*55 4.1 4.9 6.4 7.0 60*60 4.5 5.4 7.0 8.6 65*65 4.9 5.8 7.7 9.4 75*75 5.7 6.8 8.9 11.0 80*80 7.3 9.6 11.8 14.0 90*90 8.2 10.8 13.4 15.8 100*100 9.2 12.1 14.9 17.7 110*110 13.4 16.5 19.6 24.2 130*130 15.9 19.7 23.4 28.9 150*150 22.8 27.2 35.8 39.9 44.1 200*200 36.6 48.5 54.0 60.0 73.6