Our S-Series, Cambridge and OceanView double-hung windows come standard with Viwinco patented Tilt-n-Lock technology for single-handed operation and the cleanest sight lines in the industry. The Tilt-n-Lock does away with traditional tilt latches in favor of an easy to use one-handed system. The Tilt-n-Lock provides unobstructed views by housing the tilt latches and reinforcement inside the meeting rail. At the 0-degree position the sash is securely locked and the tilt latches are housed in the jambs for added security. At the 150-degree position, the hidden tilt latches are engaged but the sashes are unlocked allowing the sashes to be lifted. At the 180-degree position, the hidden tilt latches are disengaged from the jambs allowing the windows to be tilted inward for easy maintenance.