A Swedish concrete screed-rail, which is left in the slab, has been launched in Britain by Combiform UK.The V-shaped steel screed-rail, called Combiform, is available in 4 m lengths and a choice of six heights from 40 to 140 mm.Two combiform rails can be placed one on top of the other for additional heights. Where the ground is uneven, levelling screws can be fixed through the base of the rail on to purpose-made ground plates.Perforations along the rail allow rebars and dowels to run through it. A removable plastic strip fitted to the apex of the rail acts as a guide for the screeding operation. It can be either left in place or removed and the gap filled with jointing material.The V-shaped rails are easy to stack and take up relatively little storage space. The 100 mm high rail weighs about 1.5 kg a metre run, so several of the 4m long rails can be carried by one person.