This sliding closet door bottom guide is constructed of plastic. These bottom guides feature a universal design, and they are able to accommodate 1-3/8 in. thick by-passing closet doors. The mounting holes of these floor guides are spaced apart at 4-3/16 in. from center to center, and they feature 1-1/8 in. tall fins. These by-passing sliding closet door bottom guides are easy to install and are used by many closet door manufacturers.