Base elements in various widths for the modular system, 17 mm high, can be built with or without windows (corresponding wall pieces included) These can be used to create basement levels or front loading ramps for sidings or lorry warehouses. Our new Art. 40259 concrete slabs or our wooden construction panels Art. 40433 and Art. 40438 are ideal for covering the loading ramp. H0 kit, dimensions in mm: each W 18.75 x H 17 x D 10