Concrete Sturcture Accessories factory Category of Rebar Spacers Plastic Circular Spacer Plastic Circular Spacers (also known as Circulars, Wagon Wheels, Fastwheel Spacers or Wheels) is the most extensively used circular spacer for precast "concrete cancer". Height: 25mm-480mm Wire Gauge: 5mm/6mm Note: other types of Rebar Spacer and Accessories available upon requestConcrete Sturcture Accessories factory website:http://www.thitco.com/building-material/concrete-sturcture-accessories/