These deluxe sash lifts are constructed of diecast materials and come finished in a white painted color. These lifts measure 4 in. wide x 3/4 in. in height with 3-15/16 in. mounting hole centers, and they feature a universal design allowing them to be used on wooden and vinyl double hung windows. These deluxe sash lifts are easy to install and are used by many window manufacturers. Installation tip: Use caution when mounting 3/4 in... See full description for further details