Steel Angles are Hot Rolled Sections having 'L' shape. The sides may or may not be of the same size. The angles having the sides equal are known as Equal Angles. Those having unequal sides, are known as Unequal Angles. Angles are available in many different grades for differing purposes.

Description
Equal Angles
Unequal Angles
Size
25 X 25 X 3/5/6 MM, 30 X 30 X 3/5 MM, 35 X 35 X 3/4/5 MM, 40 X 40 X 4/5/6 MM, 50 X 50 X 4/5/6 MM, 65 X 65 X 5/6/8/10 MM, 75 X 75 X 6/8/10 MM, 80 X 80 X 6/8/10 MM, 90 X 90 X 6/8/10 MM, 100 X 100 X 6/8/10/12 MM,  110 X 110 X 8/10/12/16 MM, 130 X 130 X 8/10/12/16 MM, 150 X 150 X 10/12/16/20 MM, 200 X 200 X 12/16/20/25 MM, 250 X 250 X 25/35 MM
 45 X 30 X  3/4/5/6mm, 75 X 50 mm 6/8/10mm, 90 X 60 mm 6/8/10/12mm, 100 X 75 mm 6/8/10/12mm, 125 X 75 mm 5/6/8/10mm, 150 X 75 mm 8/10/12mm, 150 X 90 mm 8/10/12mm, 150 X 115 mm X 8/10/12mm
Grade
MS, IS:2062 Grade A, HT, St37-2, St52-3 
 MS, IS:2062 Grade A, HT, St37-2, St52-3

Angles are L-shaped structural steel represented by dimension of sides & thickness. For e.g. 50x50x6 means, both the sides of angles are 50mm & thickness is of 6mm. These are also available in equal & unequal sides and known as Equal Angles and Unequal Angles.