Hydraulic bottle jack designed for residential and commercial use; Serrated, heat treated saddle provides generous lifting area and secure grip Features a lifting range of 6-5/8" to 10-15/16" with a 20 ton (40,000 lb) capacity; 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 .