0.035 Inch X 1.2 Inch L-Handle Short Arm Wrench Hex Key Best Seller They are a very common

They are a very common and durable fastener used by construction workers when erecting a new building

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0.035 Inch X 1.2 Inch L-Handle Short Arm Wrench Hex Key Best Seller They are a very commonHex keys have hexagonal (six sided) tips that fit into the hexagonal shaped (six sided) indentation in the bolt or screwhead. The hex key is then turned to rotate the faster to tighten or loosen it. The hex key can be L shaped with two arms of unequal length one long and one short. The short end can reach fasteners in tight spaces while the long end extends the reach of the tool. Rotating a fastener using the long end as a handle provides more torque