This support base size is 21 x 13cm/ 8.3 x 5.1 inch(L*W); The steel rod length is 40cm/ 15.7 inch; The flask clamp length is 19.5cm/7.7 inch; The flask Ring clamps are 5.1cm/ 2 inch and 7.3cm/ 2.9 inch. The clamp and ring stand is made of strong stainless steel material, which is rustproof, corrosion resistant and high-temperature resistant. The surface treatment is smooth and will not scratch. Provides solid and safe support for your experiments. This is a complete set of laboratory support kits, which can be used to fix and support experimental containers, like droppers, beakers, flasks, measuring cylinders, and measuring cups for filtration, heating, titration, and other physical and chemical experiments.