Description： Adjustable screw top extension adds versatility Engineered using a drop forged alloyed steel construction for quality and durability; Inner/outer welded structure delivers leak-free performance 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 Capacity: 2 Ton (4400 LB) Lifting Range: 5-7/8″ to 9-1/4″ plus screw rod 2-1/4″ max 11-1/2″ Min. Height: 5-7/8″ Max. Height: 9-1/4″ Plus Adjustable Screw Rod 2-1/4″ Total max Height 11-1/2″ .