Angular iron, also known as angle bar, is a long strip of steel with two sides forming a right angle to each other. It comes in equal-leg and unequal-leg varieties. Equal-leg angle iron has two sides of equal width. Its specifications are indicated by the millimeter measurements of width x width x thickness. The specifications of angle iron are denoted by the dimensions of the side length and thickness. Domestic angle iron specifications range from 2 to 20 numbers, with the number indicating the centimeter measurement of the side length. The same number of angle iron often comes in 2 to 7 different thicknesses. Imported angle iron specifies the actual dimensions of both sides and the thickness, along with relevant standards. Generally, angle iron with a side length of 12.5cm or more is considered large, between 12.5cm and 5cm is medium, and less than 5cm is small.

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