The Williams Hydraulics 3T12TV 12 Ton Value Bottle Jack has a minimum height of 9.50 inches and a maximum height of 18.63 inches. It has an extension screw of 3.13 and a hydraulic lifting dimension of 6.00 inches with a base size of 5.25 inch x 5.13 inch . The hydraulic system is protected from internal damage by a patented by pass mechanism. The Williams Hydraulics 3T12TV 12 Ton Value Bottle Jack machined and polished cylinders with die cut threads provide non abrasive leak free, durable performance. It is fabricated from hard cast steel with heat treated critical stress areas. The serrated heat treated saddle provides generous lifting area and secure grip. The Williams Hydraulics 3T12TV 12 Ton Value Bottle Jack heat treated extension screw allows low pick up height adjustment and maximum lift height. It has a U.S. patented built in by pass device protects hydraulic system from over pumping damage. It features a unique cross type forged release valve that assures positive control. The Williams Hydraulics 3T12TV 12 Ton Value Bottle Jack has a wide, rugged base that provides stability and strength. Critical stress point are reinforced in all models for added durability and dependability. The Williams Hydraulics 3T12TV 12 Ton Value Bottle Jack is economically priced for maximum value.