Product Description These shower door bottom guides are constructed of injection-molded plastic and come clear in color. Each guide includes a strip of double sided adhesive tape to allow for ease of installation. The channels feature 1/2 inch wide openings that will allow for use with up to 7/16 inch thick glass panels. Use of these snap-in bottom-mount guides will help keep hanging glass panels aligned in their respective tracks. They are easy to install and are used by a variety of tub and shower door manufacturers. Use of mildew resistant adhesive is preferred by most (not included). From the Manufacturer This nylon injected bottom guide is for use on sliding tub enclosure doors. The snap-in design easily fits a 1/2 in. thick door rail. Used by several door manufacturers.