Designed for individuals who have difficulty sitting down or getting up from the toilet . Adds 5″ to height of toilet seat. Tool-free arms can be removed or added. Arm sleeves and receivers are made of metal. Heavy-duty molded plastic construction. Locking device with larger, heavy-duty “worm screw” and locking plate for a safe, secure fit. Lightweight and portable. Easily attaches to toilet bowl, tool-free. Easy-to-clean. Fits most toilets.