Lab Iron Ring Stand Laboratory Support Jackscrew 63mm 75mm 100mm Specifications: Material: metal&plastic Color: black&blue Size: L: length 20cm\/7.87inch, diameter 8.8cm\/3.46inch M: length 19cm\/7.48inch, diameter 6.8cm\/2.67inch S: length 18cm7.08inch, diameter 4.8cm\/1.88inch Application: it is suitable for the use of schools, factories, scientific research units, families, hospitals, laboratories, laboratory. Features: The iron Ring Stand for fixing and supporting a variety of instruments Commonly used in filtration, heating experiment. One of the most widely used instruments in experiments. Used in conjunction with alcohol lamp. Simple apparatus for laboratory chemical reactions. Rear right angle clamp can hold a maximum diameter of 18mm cylindrical object Package included: 3 x iron Ring Stands