steel wheel

wheel is a common slang name for the lowest straight, ace-2-3-4-5.

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steel wheel (plural steel wheels)

1. (poker, slang) The lowest straight flush, ace-2-3-4-5 (all of the same suit).
2. Used other than figuratively or idiomatically: see steel,‎ wheel: especially, a certain type of automotive wheel (also called steelies).

• Weisenberg, Michael (2000) The Official Dictionary of Poker. MGI/Mike Caro University. →ISBN