Omega Pro 8 ton long ram jack is intended to be used with corresponding omega engine crane to lift (not support) the rated capacity loads with the built-in hydraulic system. Hydraulic system is protected from internal damage by a patented by-pass mechanism. Machined and polished cylinders with die-cut threads provide non-abrasive leak-free, durable performance. It is constructed of heavy-duty hard-cast steel with a heat-treated chrome cylinder for added strength, and a wide, rugged base provides stability and strength. Fits most garage/shop cranes, engine hoists, and more Min Height: 24 1/8" Max Height: 43 1/4" Base Size: 5" x 4 3/4" Hydraulic Oil: 23.5 oz/ 695 ml Gross Weight: 31.5 LBS Manufacturer Warranty: One Year Omega Pro OP800S is covered with One Year manufacturer warranty from the date of the purchase.