316 Marine Grade Stainless Steel Door & Window Hardware Taking creativity, technology and engineering to a new level of excellence, the blu™ range is designed to meet the demands of even the toughest and most corrosive environments. Uniquely designed to be compatible with the most aluminium profiles and locking systems, blu™ also offer full project specification support with technical and R&D facilities. UK stocks and next day delivery as standard ensures that no project gets delayed due to availability.