Angle iron, also known as corner plate, is a strip steel with two sides forming a right angle. It comes in equal-leg and unequal-leg varieties. Equal-leg angle iron has two sides of equal width. The specifications are indicated by the millimeter dimensions of the width × width × thickness. Angle iron specifications are denoted by the length and thickness of the sides. Domestic angle iron ranges from 2 to 20 sizes, with the number indicating the centimeter length of the side. The same size angle iron often has 2 to 7 different thicknesses. Imported angle iron is marked with the actual dimensions of both sides and the thickness, along with relevant standards. Generally, angle iron with a side length of 12.5 cm or more is considered large, 12.5 cm to 5 cm is medium, and under 5 cm is small.

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