Mouttop Mouttop19 Electric, Auto-Stop Feature and Best Heavy Duty Helical Blade Sharpeners for Office School Classroom Kids Artists, AC Adapter or Battery Operated for No.2 and Colored Pencil, Black ARE YOU TIRED OF YOUR CHAIR BEING A LOW RIDER? - You can make it good as new with this replacement lift cylinder. EASY TO DO - It only takes a few minutes and a few common tools to complete this easy repair. Detailed instructions are included with your replacement cylinder. THIS CYLINDER IS THE STANDARD SIZE AND WILL FIT AERON AND MOST OTHER CHAIRS -- The bottom of the cylinder, which goes into the base (the part with wheels) is 2 inches across. The shaft on top of the cylinder, which goes up under the seat, is 1 inch across. You should measure, but chances are it will fit. HEAVY DUTY - This replacement cylinder is built tough and will offer years of service. It will lift your chair 5 inches. It is 10.5 inches at its shortest and 15.5 inches at full length. PEACE OF MIND - No phony baloney reviews here; We do not give products away in exchange for reviews; we earn your review by offering a quality product. If this part does not work on your chair, we will give your money back. We are committed to having satisfied customers.