Single burette rack made of seasoned hardwood - Stands 19.5" tall with single arm to hold a burette. Smallest allowable diameter burette or tube is 10 mm diameter. Base measures 7.75" (196.85 mm) x 4.25" (107.95mm) with a threaded hole for the wooden support dowel. Black nylon thumb screws Flasks and Burette in picture not include. Single burette rack made of seasoned hardwood - Stands 19.5" tall with single arm to hold a burette. Smallest allowable diameter burette or tube is 10 mm diameter. Base measures 7.75" (196.85 mm) x 4.25" (107.95mm) with a threaded hole for the wooden support dowel. Black nylon thumb screws. Flasks and Burette in picture not include.