The AluK 58BW Flush boasts a contemporary 45mm sash which creates the minimal sightlines that many homeowners desire. The sharp shadow line can be achieved with open-out sashes in top, side, French casement, and multi-light opening, fitted using dummy sashes. Furthermore, it features a double rebate which means it can achieve market leading weather performance even in more exposed locations, and it utilises common hardware with the existing 58BW and Heritage ST windows which ensures that it can withstand a full range of weather conditions.