The Bionic Wrench is a remarkable patented hybrid of an adjustable wrench with the ease of use of a pair of pliers. In addition, the genius of attacking a bolt/nut on all 6 flat sides removes the stress and strain on the corners of the bolt. This, coupled with the superior gripping action of the jaws, allows the user to complete their work without the wrench slipping off and damaging the bolt. The design of the Bionic Wrench multiplies your hand"s gripping force, so you can more easily tighten/loosen bolts. You can develop ratchet-like speed by fully turning the Bionic Wrench, release the grip while still on the bolt, reposition wrench, tighten grip-repeat until finished. The Bionic Wrench covers 14 sizes of fasteners from 1/2" to 3/4-inch and from 12 to 20 mm. Winner of 2005 Popular Mechanics Editor"s Choice Award. Made in the USA.