1. high quality 2. This laboratory lifting stand is made of high-quality aluminum, featuring high hardness, anti-rust and corrosion resistance, reliable and durable, and can be used for a long time. 3. This laboratory scissor jack has a height adjustable function of 30-90 mm to meet your various requirements 4. Wide range of applications: This laboratory lifting platform is widely used in small equipment for physics, chemistry and biology experiments. Material: aluminum alloy + plastic Size: 9*12.5*10cm/3.5*4.9*3.9in Colour: Black Weight: 285 grams Packing: opp bag Adjustable height size: 4.5-11CM Advantages: suitable for various construction environments, fine-tuning the direction, fine-tuning the level, height adjustment, convenient and quick main feature: Height Adjustable: The height can be adjusted by the knob. Material: Made of aluminum alloy, high hardness, rust-proof, corrosion-resistant, reliable material and durable. Application: Small equipment suitable for physics, chemistry and biology experiments. Durable and Stable: The structure is very stable, corrosion-resistant, and has a long service life.