LoggerHead Tools Bionic Wrench
Here's that bionic arm you've always wanted. You don't even have to get rid of one of the ones you've got to use it. Unfortunately, all it's going to give you super, machine-like strength to do is chores around the house. Maybe after you're done it will turn your favorite bottle of beer into a twist-off, but...maybe your favorite bottle of beer is already a twist-off. So once again, be careful what you wish for.
The Bionic Wrench adjusts to cover 16 different sizes of fasteners, and swears it's as easy to use as a pair of pliers. Maker LoggerHead Tools says it will multiply your gripping force and make tightening / loosening bolts both easy and fluid. The wrench allows for "ratchet-like speed" when you fully turn it, release the grip while it's still on the bolt, reposition it, and then tighten the grip again, repeating until the job is done.
The Bionic Wrench design enables it to grip a nut / bolt on all 6 flat sides, so there is no stress on the corners. Combined with the tool's pitbull jaws, the configuration keeps the wrench steady and in place, with no risk of slipping off and damaging the bolt (or your rotator cuff) during use.
The pictured Bionic Wrench is LoggerHead Tools' 8" version, suitable for fasteners 7/16" to 3/4" and 11mm to 20mm.