M10 x 6.7 Inch L-Handle Long Arm Ball End Hex Key Best Seller The heads use a square

The heads use a square bit #1 through #3 driver depending on the size of the screw

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s superior quality provides maximum torque and prevents rounding out of the key or hex socket

M10 x 6.7 Inch L-Handle Long Arm Ball End Hex Key Best Seller The heads use a squareHex 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