When Scepter brand MFCs/jerry cans are subjected to changes in temperature or elevation they often become extremely difficult to open. The Rocking K Cap Wrench was created to make this a problem of the past. The underside of this tool features a uniquely shaped recess that has been designed to firmly capture the ten-pointed design of the cap without pinching the retainer strap. A thru-hole allows you to easily align the retainer strap and enables you to use the tool with your pour nozzles. The wrench is machined from solid HDPE plastic which is strong, durable and should provide many years of dependable service. Two year limited warranty.