Constructed entirely of corrosion-resistant 304 stainless steel. The stainless lift mechanism with PTFE rollers provide long service life even in corrosive conditions. Their rugged construction also provides exceptional stability, even in the larger sizes. For use in a wide variety of environments, including fume hoods, solution-baths, and marine and industrial laboratories, as well as biological laboratories, where their highly-polished finish, autoclavability and resistance to sanitizing agents help reduce cross-contamination risks.  Optional ratchet handle provides operating assistance for 11.8" and 15.7" jacks, Cat.#139661-45 ... please call for pricing.