The award winning Bionic Wrench from Loggerhead Tools is a premium quality product that replaces 14 spanner sizes! The Bionic wrench defines a new class of adjustable wrenches with patented gripping technology that focuses all the pressure on the flats & not the corners. This coupled with the superior gripping action of the jaws allows the user to complete their work without the wrench slipping off & damaging the bolt. The design of the Bionic Wrench multiplies your hand's gripping force so you can more easily tighten/loosen bolts. Sizes covered metric & imperial:7mm 8mm 9mm 10mm 11mm 12mm 13mm 14mm & 1/4" 5/16" 3/8" 7/16" 1/2" 9/16”.