European styling meets outstanding design for serious performance. Tilt-turn windows operate normally in the tilt (hinging in from bottom position) for ventilation, with the option to swing the sash inward for convenient inside cleaning at a further turn of the sleek handle. Multi-point locking, combined with a durable center-seal gasket, maintains warm and dry environments. Corners are epoxy-welded and permanently staked by hefty internal corner keys, hydraulically crimped in place. The combined result of these technologies is a high-performance window that can be built to substantially larger sizes than any other projecting window design.