An extensive range of nominal sizes is available with widths ranging from 600mm to 4800mm and varying proportions of height. Each precast unit is supplied with a standard length of 1000mm.

Precast box culverts (except GSBC) are available with and without a dry weather flow section (DWF)

Box culverts are generally used where a drain crosses a road and usually for a shallow fill of less than 600mm and shall include a single of multi-cell construction.