The SUPPORTS and LEVELLERS serve for the laying of prefabricated, floating, washed shingle squares. They are made in polyethylene, a material that is frost and weather resistant. Easy to lay. By using LEVELLERS, the original 15 mm height of the SUPPORTS may be increased by another 3+3 mm. Recommended for terraces, balconies and hanging gardens or wherever raised prefabricated draining floors are required.