Wire rod, also known as wire rod, usually refers to small diameter round steel in coils. The diameter of the wire rod is in the range of 5-19 mm (usually 6-9 mm), and its lower limit is the minimum size of the hot rolled steel section.

Wire rods are round steel with relatively small diameter. The commodity form is supplied in coils. On the construction site, the common ones are those with diameters of 6, 8, 10 and 12 mm, most of which are low carbon steel. Generally, they are not used for the main reinforcement of reinforced concrete structures, but are mainly used for making reinforcement sleeves. There are also small diameter "brick reinforcement" used in brick concrete structures.