Application: This lab stand is a metal stand set, which is very suitable for science experiments and lab use Durability: The Lab Tripod Stand is made of Aluminum Alloy, ensuring long term and durability Multi Function: Its versatile design of the lab workbench equipment makes it an ideal choice for safely fixing beakers, flasks or other lab equipment during experiments or demonstrations Product Type: This Adjustable Lamp Holder, good for various experimental setups, the adjustable height (14 - 21 cm) design is versatile and functional Manual Control Teaching Instrument: This Lab Bunsen Burner Tripod Stand features manual control, making it an ideal teaching instrument for demonstrating and understanding the principles of lifting mechanisms in classrooms or labs Specification: Material: Aluminum Alloy Size Chart: Outer diameter 12cm/4.72inch Inner diameter 7.6cm/2.99inch Height 14-21cm/5.51-8.27inch Package Includes: 1pc Instrument Support Rack Note: Please allow slightly errors 1-2cm differences due to manual measurement.