Simple in its approach, the Bionic Wrench requires nothing but a good grip, the wrench adjusts itself to any 6-sided hex-nut or bolt-head, covering sizes from 12mm to 20mm. Unlike the adjustable crescent wrenches that need you to fiddle with the movable jaw, getting your thumbs greasy, the Bionic Wrench just needs you to pull the two grips together. BUY NOW!