The 8-inch Bionic Wrench ($20) is unlike any wrench you’ve ever seen before. In fact, it looks and works more like pliers than a wrench. This cleverly designed tool has a pair of spring-loaded handles and a circular head that’s fitted with six hardened steel jaws. As you squeeze the handles, all six jaws slide toward the center and lock onto the head of the nut or bolt. This unique mechanism allows the Bionic Wrench to grip hexagonal, square and even rounded fasteners. It fits six standard sizes ranging from 7/16 inch to 3/4 inch, and 10 metric sizes from 11 millimeter to 20 millimeters.