We call these Hi-Lift jacks "jacks of all trades" because they have an adjustable top clamp clevis that allows them to be used for clamping, lifting, winching, or hoisting. With a base plate of 28 sq. in. and a super-strong upright cast steel bar, the jacks are tough enough to handle any situation. They feature easy, automatic operation for raising and lowering loads, and a speedy disengagement system that lets the lifting unit drop away when pressure is removed. The jacks use horizontal operating climbing pins for safe, positive contact.