Steel bar or mesh is used to produce reinforcement for precast concrete elements. The bars have a ribbed surface, which ensures optimum interlinking with the concrete. Reinforcement bars are processed either as bar material or direct from the coil. Steel bar is available in diameters from 6 to 40 mm. Bars can be linked together into cages or mesh either by a weaving process with linking material (fastening) or by being welded. They can be straight, or bent single-sided or multi-sided.