allen key

World English Dictionary
Allen key
 
n
an L-shaped tool consisting of a rod having a hexagonal cross section, used to turn a screw (Allen screw) with a hexagonal recess in the head. A different size of key is required for each size of screw

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Dictionary.com's 21st Century Lexicon
Main Entry:  Allen key
Part of Speech:  n
Definition:  a hex head spanner designed to fit into and turn an Allen screw; also known as Allen wrench
Example:  The Allen key, screw, and wrench got their names from Allen Manufacturing Company in Hartford.
Etymology:  1961
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