They are spring-loaded, and are designed for use on vertical vinyl sliding windows.
Constructed of vinyl housing and latch with steel springSteel spring comes in a corrosion resistant, zinc plated finish and the vinyl components come black in colorDesigned for use with vertical sliding single hung and double hung windowsFeatures 2-5/16 inch mounting hole centers Easy to install with only a few simple toolsFor further dimensional and specification information, please see the line drawing Spring-loaded Sliding Window Tilt Latch, White Vinyl The mounting holes are spaced apart at 2-1/2 in. backset. These latches are easy to install and they are used by a variety of window manufactures.These Tilt Latches by Prime-Line Products are constructed of plastic and come white in color.