This is an ErGear gas spring monitor arm. You adjust the height using a hex wrench. Recommended for those who use it in a fixed position. Not recommended for those who move it frequently. Purchased in May 2023. Used with a 34-inch MSI ultrawide monitor, approximately 9kg. No noticeable scratches. Compatible with both VESA 75x75 and 100x100. The grommet-style mounting hardware is missing. Includes the adjustment hex wrench. Price negotiations are possible. Please ask if you have any questions.