Fits single hung and double hung vertical sliding windows, in addition to horizontal sliding windows constructed of aluminum frames Used without a keeper, these window sash locks mount on the checkrail of the innermost sash and engage into the checkrail of the outer sash 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 1/2 inch latch projection that engages into the checkrail of the outer sash The lock body has mounting holes that 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 Includes one lock body, 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