With a big 5/8" (16 mm) reach-out for maximum pull-in of the sash, this CRL Casement Window Lock comes in a handed version for standard or optional tandem operations on large casement windows. This lock withstands negative air pressure, up to 200 pounds (90.7 kg) of force, in commercial and high-wind geographical areas. When properly installed the sash lock can meet all known North American requirements. It will securely hold the sash against weatherstripping to prevent water/air leakage. A cut-out along the case allows for continuous weatherstrip. One lock, keeper and installation screws per package.