The WEL.KH-1 is part of apex tool group's Klein Tools line of professional level hand tools. It is a 11-in-1 combination wrench that features a precision-machined open-end jaw and 12-point box end that easily adjusts and releases. This wrench offers multiple configurations to tackle any job, including a 3/8-inch, 5/16-inch, 7/16-inch, 1/2-inch, 9/16-inch, 5/8-inch, 11/16-inch, 3/4-inch and 13/16-inch sizes. It is made from chrome-plated alloy steel for added strength and durability, and the improved knurled jaws increase torque and reduce slippage. It is also designed for use on soft materials such as aluminum, brass and soft steel.