Goelst G-Rail's 4100 Series curtain rail system is a classic design and one of the strongest tracks in the G-Rail program, with the ability to span up to 102 inches between centers, especially appropriate for wide window situations where mounting points are limited. It is most suitable for many curtain applications and also for heavy curtains when assembled with rollers or technically advanced gliders. It is already established within the commercial sector, and is now in demand for the design lead residential market.