Wickes Ground Grid Base - 100 x 100cm - This multi-functional ground grid featuring an interlocking system of 4 x 50 x 50cm pieces to build to the size required. An ideal base for a variety of garden buildings with its high load bearing capacity. For use on Driveways it is recommended that gravel, Pea Shingle or aggregates between 5-10mm are used to completely fill the grids cavities.