Cam-action lock
Increases the leverage as the window is closed to ensure a superior, weathertight seal.
Pella product lines: Standard feature on Architect Series®, Designer Series® and Pella® ProLine double- and single-hung windows; Pella® Impervia® sliding, double- and single-hung windows; Pella® 350 Series sliding, double- and single-hung windows; Encompass by Pella® and ThermaStar by Pella® sliding, double- and single-hung windows