We developed a 35 ounce spray bottle rack after one of our nice customers said he wanted his favorite Griot's Garage cleaners conveniently available. (He likes to clean his windows every morning before he drives to work.) We improved on our original design by expanding it to hold 4 spray bottles. 18 gauge steel, coated with a chemical resistant powder coated finish. The rack is 21 1/2" wide (mounting holes are 16" apart). Mounting screws included.