Feature: Height adjustable: the height can be adjusted by knob, which is used to adjust the height of objects and level in physics, chemistry and biology experiments. High quality material: made of high quality stainless steel/alumina, with high hardness, rust prevention and corrosion resistance, and reliable materials to ensure durability. Application: Small equipment suitable for physical, chemical and biological experiments. Durability and stability: the structure is very stable, corrosion-resistant and has a long service life. Specification: Material: black: aluminum oxide+plastic silver: all aluminum Color: Black/Silver Reduced size: 90*90*25mm/3.54x3.54x0.98in Expanded size: 90*90*90mm/3.54*3.54*3.54in Adjustable height: 30-90mm/1.18-3.54in Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you Please allow 1-2cm measuring deviation due to manual measurement.