Hex or Allen keys are commonly found in many applications these days, from trades, to automotive or even household items, often the correct sized Hex key will be needed to undo it or tighten it. Sometimes Hex bolts are used in areas that require a larger torque amount to be applied when tightening; in automotive applications for example, in this situation using a typical Hex key can tiresome work. Often longer length Hex keys as found in the ToolPro 18 Piece Long Arm Hex Key Set are required to provide the extra leverage needed to tighten or loosen more heavily torqued Hex bolts. This kit comes complete with both metric and imperial sizes; all contained in a handy storage case which keeps both sizes separated visually and physically from each other. As is found in any quality hand tool, the ToolPro Hex Keys are all made from chrome vanadium steel.