2.25 Fits single hung and double hung vertical sliding windows, in addition to some horizontal sliding windows constructed of vinyl, wood and aluminum These locks mount on the check (or “meeting”) rails of single and double hung sash where their checkrails rest flush when closed Replacing loose-fitting, worn or missing sash locks can help restore and increase the safety and security of the home or office These cam-action sash locks feature a slim line style keeper and low-profile lock The mounting holes of these components are spaced apart at 2-1/4 inch, on center Each lock is constructed of durable diecast zinc and come in a white-painted finish Included with each package are one lock body, one keeper, installation fasteners and simple instructions These sash locks can be installed with a simple handheld Phillips screwdriver Please refer to the line art drawing for dimensions and compare with your needs before ordering