Ka-Bar Wrench Knife
Ka-Bar's Wrench Knife is a wrench in name only, though a knife also in practice. Its drop point fixed blade is 3.0" long, and the knife's total 7.125" length is made from a single piece of 425 high-carbon stainless steel.
The "wrench" handle is really just a circular cutout that mimics the look of the bolt-twisting tool, likely because fitting a knife with an actual wrench handle would result in many, many Darwin Awards and lawsuits.
Ka-Bar includes a hard plastic sheath with the Wrench Knife so you can use its loop for belt or neck carry. Total knife weight is 3 ounces.