Rebar Coil, also known as wire rod, is a commonly used name in the construction of construction projects, indicating the reinforcement with a diameter of less than 10 mm. Because the rebar less than 10mm is easy to bend, the manufacturer will roll the long rebar into a circle in order to reduce the length before transportation, which is referred to as circle on the construction site. Rebar Coil (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. Small diameter bricks are used for reinforcement in brick concrete structures.