BIG RED hydraulic long ram jack has designed for residential and commercial use. Constructed of heavy-duty steel with a heat-treated chrome cylinder for added strength. Fits most garage/shop cranes, engine hoists, and more.100% factory tested for reliability and safety to meet and comply with ASME PASE safety standards.Features a lifting range from 24-3/8" to 43-7/8" with a 3 ton (6,000 lb) load capacity;Glide-action pressure pump is designed to lift with minimal effort; Integrated built-in oil-bypass and overload valve that protects the hydraulic system from extending beyond limits. If you meet any problems, please feel free to contact our customer service team and we will do our best to help you fix your issues.