Klein Tools' new Pro Folding Hex Key set conveniently consolidates two sets into one. The heavy-duty 11-piece set includes a high leverage, 4-Inch long 1/2-Inch key. Industrial strength, extended reach blades open independently up to 270 degrees, and a precision fit design to reduce slippage and stripping. The durable handle is made of reinforced nylon with a comfortable grip. The heavy-duty Pro Folding Hex Key set is built specifically for a rigorous job site.