Prime-Line Products M 6191 Shower Door Bottom Hook Guide,(Pack of 2) Gray Product Description This shower door guide is constructed from gray plastic. It helps to keep your shower door on its track. This style guide fits on Keystone Brand and similar styled tub enclosures. From the Manufacturer This shower door guide is constructed from gray plastic. It helps to keep your shower door on its track. This style guide fits on Keystone Brand and similar styled tub enclosures. Features For use on sliding (top hung) shower door (tub enclosure) systems manufactured by Keystone These shower door bottom guides help keep sliding door panels centered to their respective tracks Constructed of gray plastic Easy 2-fastener installation Guides measure 3 in. wide x 1-1/2 in. tall w/2-inch hole center spacingft.s USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.