Hex

Hex keys have hexagonal (six-sided) tips that fit into the bolt or screwhead's hexagonal (six-sided) indentation. The hex key is then turned to tighten or loosen it by rotating it quicker. The hex key can be in the shape of an L, with two arms of unequal length, one long and the other short. The tool's short end allows it to reach fasteners in cramped locations, while the extended end increases its reach. When using the long end of a fastener as a handle, greater torque is applied to the fastening than when using the short end. While compared to L-shaped keys, T-shaped hex keys have one long arm with the driving tip at the end and a handle that can give higher torque when spinning bolts.