Bifold Doors. Sliding Shower Door. 5mm safety tempered glass, BS EN 12150 & CE certified. Sliding Doors. Shower Trays. Stone Shower Tray. Bath Screen. You have to leave space for the waste and pipe to run in the floor,so you can not install the tray on a concrete floor.If you want to install the tray on a hard floor,pls buy the riser kit from us.