PivotTrue I4 is an innovative solution for tilt slider windows which adds benefits in window fabrication, operation and ventilation This patented tilt mechanism, uniquely locks the sash in the header and sill to achieve maximum window egress and home ventilation; while providing easier window cleaning over traditional slider windows. The popular Instalock system offers plenty of product option and sizes to fit almost any window extrusion in the marketplace. With only a few parts to the entire system, PivotTrue I4 improves the ease of assembly and installation to lower manufacturing and inventory costs over competitive offering. Experience the difference... The Instalock difference.