A hex key, also known as an Allen, zeta, or Unbrako key or wrench, is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive). The name zeta refers to the fact that zeta is the sixth letter of the Greek alphabet. The term hex-head is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional use referring to external-wrenching hexagons. In the fastener industry, the terms socket head or hex socket head are generally used for the driven part of the driver-driven pair.
Matt: WRONG
Record: 88-71
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