What are the length dimension of section steel?

Length dimension of section steel in different shapes
1. The standard length of the train track is 12.5m and 25m.
2. The dimensions of round steel, wire and steel wire are calibrated in millimeters (mm) of diameter d.
3. The size of square steel is calibrated in millimeters (mm) of side length a.
4. The size of hexagonal steel and octagonal steel is calibrated in millimeters (mm) of the distance s from opposite sides.
5. The size of flat steel is calibrated in millimeters (mm) of width b and thickness d.
6. The dimensions of I-beam and channel steel are calibrated in millimeters (mm) of waist height h, leg width b and waist thickness d.
7. The size of corner steel is calibrated in millimeters (mm) of side width B, b and side thickness d.
8. The size of H-shaped steel is calibrated by the number of millimeters (mm) of web height h, wing plate width b, web thickness t1, and wing plate thickness t2.