To adjust the Hydrokinetic Adjustable Wrench, just open the valve, fit around the nut or bolt of your choice, and push the gripper on the opposite end. It will compress the liquid which will, in turn, push the gripper on the end you want. Once it is snug against the nut [haha...innuendo], close the valve and your Hydrokinetic Adjustable Wrench is locked into position. It's that easy! The slim heads of the wrench will let you sneak it into tight spaces, and the design of the grip will help you turn even damaged nuts and bolts.