18in Chrome Chair Height Extension Kit

Height extension kit easily convert Alvin® office-height chairs into drafting-height models. Each kit includes a strong cylindrical steel shaft with tapered end to lock into the chair base. Adds approximately 7½" to the height of the chair. Foot ring can be adjusted vertically and then locked at the desired height. It is recommended that extension kits be attached when the chair is first assembled. See individual chairs for compatibility.