These are the H Cross section used in the joints; they are available in multiple dimensions and formats. It is the difference between the width by height ratio in the case of I beam. The width of the flange would be equal to or more than the height of the cross section
In the case of I section, the height of the cross section would be higher than the width of the flange.
The shear strength is better in the case of I beam. These Products Basic sizes available are as under: