The Hydrokinetic Adjustable wrench lets you fiddle with twenty three different sizes of bolts and nuts. The secret lies in the wrench’s liquid core. To adjust the Hydrokinetic 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 push the gripper on the end you want. Once it is snug against the nut, close the valve and your wrench is locked in position. The slim head will let you tackle even the tightest spaces and the design of the grip will help you turn even damaged nuts and bolts. Hydrokinetic Adjustable Wrench is available at ThinkGeek for just $25.