Heavy-duty: This 10" Long Stroke gas lift cylinder is made of thicker alloy steel, engraved with the mark of SGS inspection, the quality is reliable. Universal size: This 10" Long Stroke Gas Lift suitable for most bar stool, drafting stool,drafting chair,high stool chair ( Please measure dimensions before you purchase it ) Adjustable height: The height of the gas lift cylinder fully compressed is: 17.7", and the height fully expanded is: 27.7". This means that it has an 10-inch adjustable height that allows you to rise higher and use your office chair in more scenarios Easy to install: Usually you may need to use a hammer to take out the old gas lift cylinder and replace it with a new one. (We suggest you search for "gas lift replacement" on youtube for instructions) 5 year replaceable:If our lift cylinder fails, leaks or begins to sink, please email us and we will send you a brand new cylinder.