The K65 Fline system can be made of steel or stainless steel. Being highly fireproof and durable, this system enables architects to design doors and windows that allow maximised natural lighting or a much wider range of window quilt patterns for historic buildings.

All components of the K65 Fline have been manufactured through standardisation and industrialisation. Noticeably, this system applies dry installation, which makes it easy to maintain and recycle, thus energy-efficient.